Research your cd you are selling and get an idea how much it's worth
Put a reserve price on that is reasonable and that you wouldn't sell it for any less.
Describle you cd with detail ,country, year of release ,track listing anything which you think might help it sell,Answer Any Questions best to your knowledge.
List your Postage costs and any Discounts
This Way You are been upfront and customer will not get a nasty surprise at the end of sale and feel cheated.
People will buy with lots of Good Feedback.
Offer People As many Methods of Payment Possible
So be Honest in describing your cd Don't Sell crap Just not worth it.
Describe condition of cd carefully ,Package item well to arrive the same way you sent it.Post Item ASAP
Your On Your Way To Been A Great Seller
Check Sellers Rating and Feedback
Make sure he meets your requirements If In Doubt Ask.
Do some Research Don't Bid more than you can afford .There's always tomorrow .