you can also google for either
easyubuntu or automatix (I've currently got automatix installed).
Once you have one of them installed, when you "fire them up" they both offer the option or adding the various codecs for lots of audio/video apps/facilities in the easiest possible way.
I'm thinking that thats gonna be your best bet, until you are more familiar with the OS.
regards
John
p.s. Oh and I prefered easyubuntu over automatix - which I'm going to uninstall.