I"m quite the novice myself...but starting to try to shoot music venues here in New Orleans.
ONe site I found that has been useful is:http://froknowsphoto.com
He has a low light guide for shooting concerts traded for your email address. However, he has a LOT of stuff on Youtube showing how to shoot concerts, go search and you can find some good info on there.
I don't think you're gonna have much use for any glass slower than f/2.8.....
Are you going to be in the pits in front of the stage? If so, then maybe you can use 50mm...but for anthing close up, maybe 135mm f/2 for a prime (I've not shot with it, but I hear GREAT stuff about it). But I'd say that likely the 70-200mm f/2.8 IS II L lens would be your workhorse on this....
If you can get ON stage, like behind the drummer (do you know the band?)....a nice super wide angle fast lens might be fun....a fisheye to show from the stage seeing out the big audience?
But the Fro guy also has some videos that work with how to get IN with bands, by finding the manager, what to say what to ask for....etc. Being a cool guy and easy going and just plain asking seems to be a good thing. One thing is, if you never ask, you never know if you can get stage or better access.
Also, and again, I'm BARELY starting myself. But one thing I gleened from my research on this....RED lights....if you have tons of that....make for great B&W photos!!
Hope that helps...PLEASE...post back your experience, and some sample photos from your shoot!!!