I've search Google and for the past 2 hours I have been writing code and nothing seems to work, I keep getting error messages and Im almost bald with pulling my hair out!
Have a look here: http://www.apple.com/itunes/whatson/podcasts/specs.html It's easy enough to do if you take the example and customise it for your content. This shows basic RSS and the custom itunes tags so your feed can be submitted to the iTunes store.