dewthedew said:
so what do i do about lighting?
You're going to want to use ambient lighting. Otherwise, it'll look all flashy and ugly. If it's really, really dark, you could also diffuse a flash into the ceiling, or if you have wireless capabilities, put a couple of flashes on either side of the stage, also diffused to the ceiling.
Oh, and about the 50mm being too long, it really depends. Sometimes I wish I had something wider, but most of the time I'm actually wishing had something longer, like a 70-200 2.8. Either way, you're gonna need fast glass, and the 50 is bang for buck, as far as I'm concerned. Too long or too short depends on the venue, but I think it's a workable focal length.