How does iTunes work?

I am considering getting an iPod touch. I want all the apps, etc. that are available on iTunes. But, how does iTunes work? My brother has a zune and uses LimeWire to get his songs. I would do that if it weren't for the apps. Could I use LimeWire for my songs? (since its free) and use iTunes to get apps,... show more I am considering getting an iPod touch. I want all the apps, etc. that are available on iTunes.
But,
how does iTunes work?
My brother has a zune and uses LimeWire to get his songs. I would do that if it weren't for the apps. Could I use LimeWire for my songs? (since its free) and use iTunes to get apps, videos, etc. How much do apps and/or music/videos cost?
And what other details do I need to know about using iTunes?
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