Wot the hell can I use this for?

[JD Soul]

My girlfriend bought me a CD writer for Xmas! She thought it would be a good idea so I could copy music and stuff.

I have two questions for the board, I use Winmx to download MP3 and MPEG.
1. Can I burn these onto a CD-R using my supplied software "Nero 5" ?, if so
2. Will audio play on cd player and video on DVD player?

Any advice and I mean any would be helpful!