Hey Curtai - WELCOME!
...to the mad obsession known as the carpc devotion. Not a hobby, a real devotion!
It's great that you have a friend in the real world who already has his carpc setup running. That can be a great big shortcut for you - learning from his efforts. That's what many of us do here on mp3car forums - share with and learn from one another. What could be better?
For me, I initially just wanted to rip my personal cd's 'losslessly" (.wav format) onto my carpc, and play my music sounding most awesomely. Ripped the cd's, installed a Creative pci sound card, installed some amps and spkrs - sounds just delighful!
I use the internet from carpc quite a bit, too, for e-mailing and just generally researching the world around me as the miles roll by.
Best of luck and blessings on your endeavor.