Don't ask me, it's been written to death. First, go to Ebay and read the tutorial - don't just read that one, spend some time there.
Then, go to Paypal and read the tutorial
Then, buy a few things on Ebay to see how it works.
Don't use your e-mail for your Ebay name, unless you want to get all the Spam in the world
Do follow through on all your bids, or don't expect much success selling anything
Note - if the price is above what you said in step one, and you still want to bid, then you were lying. Stop lying.
As to selling, do a lot of browsing and a little buying first, so that you
can have a feedback score that shows you're not a chump. Then, my
simple method is as follows:
The key to finding realistic pricing is to search completed items - there's a box on the left side of the screen.What stuff is listing for doesn't matter, since most of the bidding goes on in the last 5 minutes of the auction anyhow.
I wouldn't start an auction at what the thing's worth - most things listed that way just don't move, and you pay a higher insertion fee. Use reserves if you want. I only use them when the item in question is obscure and not routinely traded. For commodity items (computer parts, bicycles) I start as low as I can stand, and more bidders get into it.
If you've never sold anything before, I wouldn't start with a high-dollar item, since people judge the seller's past performance in deciding how much to bid.