How to ask for a raise

I once worked at a restaurant for 6 months and they never wanted me to leave but I had to focus on school. Now that I dont have to worry about school as much, i was thinking of working there again, full time and experienced. I would get paid 8 an hour but I dont want to return to that wage because I could get that somewhere else. The interview is tomorrow and the guy is a new manager so he has only heard good things about me. I am wondering how I can bring up the possibility of getting paid 8.50 at least