What should I ask when finding a contractor for a BRRR

[Luke Stewart]

I am looking to possibly do my first BRRR on a duplex this spring. It is two units of 2BR, 1BA with unfinished basements that will include 2 br, laundry room/storage and living room. So in the end 4BR, 2ba in each unit. The kitchens also need to be redone with minimal wall construction. What kind of questions do I ask contractors when talking to them on the phone?