Experienced eBay seller and buyer here

(that's what my "far-trader" handle was originally for).
It can be fun, and profitable, but it's not for the novice to jump in. Especially now as opposed to a few years back when I sold there. There are all kinds of scammers just waiting for a new seller to list stuff so they can rip you off or just mess with you for fun. I'm not saying don't, I'm saying get a little education first. Read some of the discussion forums for the kinds of problems you might have. Read ALL the new to eBay stuff and guides.
To get good prices there you need multiple bidders who want it. To maximize your potential you have to gamble and start your auction low and hope bidding takes off.
To get the most bidders interested answer as many questions as you can in the listing and include actual pictures, taken in good light. Or for flat items scan them. You only really need one image per auction for most items. And know that no matter how well you think you answered all questions, you'll probably still get some. Even some answered in the listing. Be quick to answer, and keep it factual and polite, even if the answer is there in the listing.
Above all be brutally honest in describing the item quality. If you oversell it and the buyer doesn't agree when they get it you'll be eating the sale one way or another.
Include the shipping and handling clearly in your auction listing for fewer questions and more interested watchers. If you don't want to ship outside the country list that clearly, several times. If you do want to ship outside the country only ship by airmail.
When shipping you have a choice. Online tracking delivery confirmation or not. If not the buyer can claim they never got it and they can get their money back. You're out the money and the item and still have to pay eBay fees. If you have tracking only ship to their PayPal address to be covered (rules may differ in some countries, check yours). You can skip the expense if trust people in general, most of them are honest and you will get more bidders if the s&h is low.
As far as making a killing Gruffty, if you follow some of those high priced BIN (Buy-It-Now) auctions, they NEVER sell. That's almost always true. They keep getting relisted and still don't sell. The seller should clue in and realize nobody will pay that for the item. But I have seen some items go for more than those crazy BIN prices, when the starting bid was $1. Auction fever rules, as long as you as the seller can take the chance it may sell for less than you wanted.
That's another point, related. Reserve price. Don't bother. Buyers don't like them. It costs you more and you are less likely to sell the item. If you have a minimum you will take for something just start your auction at that price. Even mention (in every auction even) NO RESERVE! Buyers like that.
More will come to me I'm sure but this is a good start
