Your reputation as a buyer (or 'feedback rating') is the most important thing people see when they deal with you on eBay. It is on the basis of this little number that they will decide whether they can trust you or not.

Each time you buy or sell something on eBay, people can leave feedback for you, and you can leave feedback for them. This feedback can be positive, negative, or neutral, along with a comment. Your feedback rating, then, is worked out using a very simple sum: the number of positive feedback comments people have left for you, minus the number of negative ones. This means that someone with a feedback rating of 28, for example, might have 30 positive ratings and 2 negative ones.

If you are a considerate buyer, then you should find that positive feedback will just appear next to your username, without you needing to do anything. If you want to help it along, though, there are a few things you can do.

Always leave feedback for others: People will feel an obligation to leave feedback for you if you leave it for them (eBay will send you an email after each transaction to offer you the opportunity). Take the time to write a positive comment about sellers who do what they should and the chances are they'll do the same for you.

Pay promptly: Sellers love nothing more than to be paid promptly - paying as soon as the auction ends saves the seller all sorts of worry, especially if you pay by credit card or another electronic method. You will often find that your positive feedback appears within a few minutes of you paying if you pay as soon as the auction ends.

Don't be a difficult customer: Understand that your seller might take a day or so to respond to you, and perhaps a few days to send your item - harassing them is nasty and unnecessary, and won't get you good feedback.

Build relationships: If a seller sells a lot of a certain kind of thing you like, buy from them a few more times. They will be very happy to find a regular customer, and will go out of their way to leave positive feedback like 'a joy to deal with as ever'. Also, they might offer you a few special deals!

Sellers won't generally be reluctant to sell to buyers without much of a reputation, simply because it is the buyer who takes most of the risk in a transaction. It is worth remembering, however, that transactions where you are the seller and where you are the buyer are counted towards the same feedback total - so if you ever want to start selling, being a good buyer is especially worthwhile.

On eBay, people pay far more attention to sellers' ratings than they do to buyers' - most sellers can't be bothered to check their buyers' feedback, while bad feedback on a seller can (and should) be a dealbreaker.

So you've got the buyer in front of your auction, and they've read the description. They're must be interested, or they wouldn't be looking… but just how can you push them over that line and make them leave a bid? Read on for some tips.

Improve your picture: In all that description writing, you might have missed the vital importance of your item's picture. A picture with bad lighting or an intrusive background looks amateurish and won't make anyone want to buy from you.

Add an About Me page: You'll be surprised how much you can reassure bidders just by creating an About Me page and putting a little bit about yourself on your business on there. You can also have a few special offers there for people who bother to look at the page, and let people subscribe to your mailing list so that you can email them updates.

Use SquareTrade: Signing up at SquareTrade and displaying their logo on your auctions shows that you are committed to have them resolve any disputes that arise. You always see this on PowerSellers auctions - it makes you look more professional.

Write terms and conditions: Have the 'small print' clearly visible on all your auctions, giving details of things like shipping times and prices, your refund policy, and any other business practices you might have. This helps build confidence with buyers.

Show off your feedback: Copy and paste a selection of the feedback comments you're most proud of to each item's description page, instead of making bidders go and look for it. If you have 100% positive feedback, be sure to write that on every auction too.

Add NR to your titles: If you have extra space in a title, put 'NR' (no reserve) on the end. Bidders prefer auctions that don't have a reserve price, and doing this lets them see that yours don't.

Benefits not features: Make sure your description focuses on the benefits that your item can give to the customer, not just its features. This is a classic sales technique. If you have trouble with this, remember: 'cheap' is a feature, 'save money' is a benefit.

List more items: If you want more people to respond to your items, then list more items! You might find you have better like listing items at the same time, instead of one-by-one. There's no need to use a Dutch auction - you can just keep two or three auctions going at once for an item you have more than one of in stock.

Accept unusual payment methods: To reach those last few buyers, accept payment methods that many sellers don't, like cheques.

Buy some upgrades: The best upgrade is the most expensive one, which makes your item appear first in search results. In crowded categories, you might find that this is worth the money.

Once you've got some buyers, you want to keep them coming back to you.

Trying to be help your buyers find your auctions can be a truly daunting task. Most people only search eBay by title, not by description, and that means that you only have those 55 characters of the title to cover all the possible search terms. That's not easy. In this email, I'll give you a few pointers.

Don't bother with eBay clichés: There are plenty of eBay auction titles that say things like "Super rare camera wow look low price". These are stupid things to put in your title, as no-one is going to search for them.

Think like a buyer: If you were looking for your item, then what exactly would you type into that box? If you think it'd help, try searching yourself to find someone else selling your item. What were the first things you thought of typing?

Think like other sellers: Keep an eye on which sellers are doing best with items like yours, and try to copy their title styles - if it works for them, it can work for you.

Be specific: You should be sure to write the item's brand and specific model number in the title, as people will often search only for this information. Make sure that you also say exactly what the item is.

A Few Examples.

Here are a few examples of good titles. They're real, and they're on eBay right now, making their sellers money. So what makes them good?

"Dell Latitude Laptop P3 500mhz Notebook PC Computer"

If you know about computers, you'll know instantly what this auction is selling. It has manufacturer (Dell) and product line (Latitude), followed by a few technical specifications (P3 500mhz is the processor speed). Notice also that the title includes the four words 'laptop', 'notebook', 'PC' and 'computer', as the seller wants people looking for any of those words to see his auction.

"OASIS Don't Believe the Truth CD Album (New)"

This auction for a CD is well formatted: it gives the artist name in capital letters, followed by the album name. It then manages to include the two key words 'CD' and 'album', as well as the word 'new' - that means that anyone searching for 'new oasis cd', 'oasis new album' and so on will find this auction.

"1840 Penny Black stamp, certificate, four margins"

Here's a slightly more obscure one, from the exciting world of stamp collecting. A penny black is one of the oldest and most famous stamps. It uses a few key words that collectors will consider important: 'four margins' indicates that the stamp has been cut out with some margins around it and so isn't damaged, and 'certificate' tells you that the item has a certificate of authenticity - it's a real penny black. Remember to use every bit of space to squeeze in as much important information as you can in the title.

So now that you've written a winning title, you need to start on a great description.

So what's a PowerSeller? PowerSellers are the people on eBay who've made it, recognisable by the little 'PowerSeller' badge next to their name. You've probably seen these people around - and to succeed on eBay, you want to think the way they do.

How to People Get the Right to Call Themselves PowerSellers?

eBay gets to decide who can be a PowerSeller and who can't, and they have strict requirements. To get in at the minimum PowerSeller level, you must have a feedback rating of at least 100 (minimum 98% positive) and sell at least $1,000 worth of items every month for three months in a row. There are different levels of PowerSeller membership as you sell items of greater value: $1,000 total is bronze, $3,000 is silver, $10,000 is gold, $25,000 is platinum and $125,000 is titanium.

If PowerSellers ever fail to meet the required amount of sales, or their feedback falls below 98% positive, then they lose their PowerSeller status. In short, the only people who get to be PowerSellers on eBay are the people who have been successful for a good while, and are on track to stay that way.

The Shop and the Marketplace.

This is the most important part of understanding how PowerSellers think. They don't see what they're doing as being some random bazaar, or a hobby - instead, they see themselves as a business.

Put it like this. If you run a stall in a marketplace, the chances are that you have a general area of business, but you mostly just sell whatever you can get your hands on that week. If your dodgy buddy got his hands of a job lot of something at a discount, then that's what you'll be selling. This might be fun - and when you have a good week, you'll have a really good week - but it's no way to run a real business in the long-term.

PowerSellers think far more like shops. They sell the same things again and again, every week - regular stock for regular customers. They do 'boring' business things like keep inventories and budgets. They know what they're going to be selling, how much they buy it for and how much they expect to sell for. Just like a real shop, there can be hard times sometimes, but their income is stable and their business can grow slowly.

The best advice I can give you on thinking like a PowerSeller is this: don't take long-term risks for short-term gain. Look after your reputation, manage your selling properly, provide good customer service and the rewards will come to you in due course. And you'll get a little badge next to your name that makes people trust you more!

One possibility that you might have realised so far is what eBay can do for any other businesses you might have. Remember, millions of people visit eBay every day - why keep everything separate when you're starting to tap into that kind of power?

Going full-time as an eBay seller is living the dream: making a real income, working from home, being your own boss and all the rest of it. It's the promise of a million scams, and it's finally come true - at least for some.

What they don't tell you in the success stories, though, is that becoming a full-time eBay seller is by no means for everyone. You really, really ought to try it part-time before you even consider taking it up full-time, and even then, caution is advisable.  Before you burn your suit, here's a list of questions you should ask yourself.

How Much Do I Earn From eBay Now?

Work out how many hours a week you spend doing eBay-related things (be honest here), and divide it by the average amount of profit you make in a week. If you were doing full-time hours, would you earn as much as you earn now?

Do I Have a Good Job?

Think about what you might lose if you give up your job to focus on eBay. If you're in a well-paid job with good promotion prospects then it's well worth reconsidering: you might get a few years down the line and wish you'd stayed in your traditional job, as you'd probably be the CEO by now.

Would I Really Make Much More Money?

Unless you're selling a large quantity of small goods, most of what you do on eBay will be waiting for auctions to end - and you can wait at work just as easily as you can at home. This is why whether you would make more money on eBay really depends on what kinds of items you're selling - for low value items, going full-time could be a good move. For high-value ones, the chances are you'll hit the limits of how much money you have to invest in inventory long before you hit the limits on your time.

Is my Home a Good Place to Work?

Quite apart from anything else, you might find that the dream of home working is more of a nightmare in reality. People can start to depend on you to get things done that need to be done during the day. If you have a wife and children then they can resent the fact that you're in the house but refuse to have anything to do with them for large parts of the day. Giving in to any of these things and stopping work for a while will cause your profits to fall.

Can I Survive if it All Goes Wrong?

In the end, would you be able to get by if you had a month or two where you sold literally nothing? Or would you be desperately looking around for a job and cursing the day you ever discovered eBay? That's the real test.

If you made it through all these questions, then I guess you're cut out for the eBay life - and even if you didn't, you'd be surprised just how far you can get part-time.