i-pod assistances

[Duel-Keyblades]

i think i'm going to get one of those new i-pod shuffles, but i don't know how the whole thing works. So does anyone have an i-pod and could help me.
my questions are, does the i-pod come with a service to some music download site or something, is the service free or do you have to pay a monthly fee, and how do you download the songs? thanks!