How do u sell ur purchased music, How do u sell ur purchased music

If you are talking about music you purchased from the iTunes Store, you may not sell it. The terms of purchase are that it is for personal non-commercial use only. You may not resell it, nor may you use it for commercial performance.

If by any chance you are talking about music you have created that you wish to sell through the iTunes Store, see this page:

http://www.apple.com/itunes/content-providers/