Here are the key points to remember:
Before you place a bid, you have to be a registered eBay userand you should check out the feedback rating and comments of the item’s seller.
You place your bid in the Ready to Bid? section of the item listing page; then you enter your user ID, password, and the maximum bid you’re willing to make.
eBay’s proxy bidding software manages your bidding, raising your bid as necessary up to but not exceeding your specified maximum bid amount.
If, at any point during the auction, you get outbid, you have two options: Place another (higher) bid, or walk away free and clear.
When you win an auction, you’ll be notified by eBay; you should then contact the seller to arrange payment and shipping terms.