How to list my songs on iTunes store?

I don't know if you can do it on your own, but it's pretty easy to do it through Tunecore or CDBaby.

Following are the requirements for selling on iTunes Store

1) In Order to sell your music through iTunes Store you will have to complete iTunes Connect application.

2) You must have an Apple ID and a current credit card on file with the iTunes Store.

3) iTunes requires that all albums have a UPC Barcode and all individual songs have an ISRC. More information here

4) You also require a U.S. Tax ID as part of the iTunes Connect sign-up and authentication process.