Replying to I'm doing a promotional video for a bar

This is my first one I just got my t2i yesterday and don't have alot of expirence shooting . I'm going to be inside, it'll be dark and I'll have my fifty. I know I can make a good video but if anyone has any advice I'd love to hear it. I've never filmed with a fifty before, obviously i'm going to have to auto focus it at all  times but should i keep anything in mind perticular? and if you've ever done one or have any examples post up?