I think it depends on the quizzes that you're going to be going to. I used to go to two every week in the US (yes, I'm a geek), and they were completely different. One was very much general knowledge; while the other had lots of local current events, word play and esoteric music. The key is to have a well-balanced team. Ours was a team of four with one person really good at pop culture, one who knew history and geography inside and out, one music buff and one with good all-around knowledge.
My advice would be to go the first time without expecting to win - just scope it out and try and work out what sort of questions they ask. Then you'll know what to do the next time.