What to know about renting a duplex?

I am in college and am about to move off campus. Two other friends of mine have settled on a three bedroom duplex, It's $1,050 a month and we can afford that. We just toured it today and liked it a lot, what all should we know before we go to talk "details" as they put it, and what should we know before we sign the lease? How much money should we have saved up prior? How much will we be asked to put upfront at signing and what information should we bring? Anything else I might be missing?