There are a few basic rules when setting up an interview situation which will get you the best quality look. Rules aren't everything and I believe in trying new styles, but I also believe you need to learn the rules and get to know them well before breaking away from them. I cover a few points in this video:
There is a lot more to be aware of when interviewing and I'll be covering asking the questions next time but for now this should give you something to go on. I really hope it's helpful.