Let me help you!
buck dich - befehl ich dir
wende dein Antlitz ab von mir
dein Gesicht ist mir egal
buck dich
means ->
Bow for me - I ask you gently
I wanna see your face
Because it's so nice
Bow for me
Well.. it's close to what I just said! xD
You are about the third person I've heard of this semester needing to learn German. I'm telling you right now...I took a semester and half of it, and it's VERY DIFFICULT. However, a priliminary search on the internet brought up several sites that can help.
I know the University of Texas has an interactive website for learning French (which really helped me out when I needed it). I think they may have one for German. Try a search like that, or any books from your bookstore or amazon or something like that.
PS...if all you really want is to understand Rammstein, there are many lyric translation sites that I understand from German speaking friends are pretty accurate.
Good luck.