Advice Needed! Meeting with a wholesaler today!

[Makina Turner]

So I've decided to go look at a few houses that a wholesaler has. My husband and I are interested in flipping one to start out. What questions should I ask the wholesaler? I don't think he has them locked down because he won't give me an address so that I can do due diligence. And some of the houses have back taxes owed. Any advice is greatly appreciated.