Zune 80 GB Help!?

I'm getting a zune 80 GB soon. I've never had a zune before and I've only ever owned one other mp3: a 2 GB ilo from Wal-Mart. For my ilo I got my songs from my own CDs, Walmart.com , emusic.com, and Amazon.com. My songs are all mp3 or wma format, both of which the zune takes, and they are stored in my Windows Media Player. Will I be able to use these songs on my zune? When I get the zune if the zune software doesn't have a song I'm looking for , can I download a new song from wal-mart or amazon and put it on the zune? Also, does the zune store have a lot of artists not well-known that mostly just copy other artists songs (like the songs on emusic) or are the songs they offer better known such as song by Skillet, Fireflight, Within Temptation, Panic! at the Disco, etc. Also, how easy is the zune to use for technology challenged person (like me)? Would you recommend it?