Ebay can be a great place to buy and sell and it can also be a brutal place. Read the "anyone got cheated in ebay before?" thread. IMHO some of the most important thing to remember about ebay are: don't send any money western union, no wire transfer, no local pickup unless you get cash and know every paypal rule down to the T. If you make a mistake with a scammer, they'll initiate a Paypal dispute and recover their money and have your item. Some scammers will receive your item and replace it with their broken item and send it back and say it was broken and want their money back. Scammers love to buy software and then burn a copy of it and then dispute the transaction and say the software didn't work.
I've had way better luck with selling on Craigslist than ebay. With Craigslist, meet in a local spot and request cash. Ebay just raised their selling fees 50% and it will end up costing you about 12% to sell an item on ebay and put up with the scammers. On ebay you will be paying a listing fee, selling fee and Paypal fee and Craigslist fees are zero. Not everyone on ebay is a scammer, but there's no shortage either. I have been scammed on ebay a number of times and never on Craigslist. There are scammer on Craigslist as well and they want to pay you by bidpay, alertpay etc.. don't do it, cash cash cash. I'm not trying to scare you away from ebay, I'm just giving you info to make good decisions.
Good luck.