What is the best way to vet a contractor?

[Jimmy Mozingo]

We are submitting an offer on a fix and flip with a rough swag of rehab costs coming in at 75-80k. We are waiting for the home inspector to complete his analysis of this property to help us develope a scope of work that we can have when we do a walk through with a GC. Is this even the way to go about this? Are we doing this backwards? We have heard plenty of horror stories regarding contractors. How do we insure we are getting a reputable trustworthy one? 

A lot of stuff here, sorry about that. Any advice would be greatly appreciated.