Newbie question on putting an offer in

[Steve Candor]

i want to put an offer in contingency of contractor inspecting. Do I also. Need to put contingincies on things like rents are actual rents stated in MLS. That he's actually collecting the rent, utilitiy cost is what he said they are?? Or are those given? Also the listing agent said all units are deleaded. What if they aren't? Can I back out? Or is everything like this have to be specifically stated?