Found a roofing contractor - Now what?

[Jaron Walling]

It's springtime and my property needs a new roof! I have quotes from different contractors and narrowed it down to one. He checked out with another investor, has been great with communication (shocker), and has a better price. What should I look out for if I hire this crew for job? We worked out the details of the job but it's not in writing yet. Any advice or stories would be appreciated. 

Thanks