Ive gotten plenty of jobs at fast food, they will ask about previous work exp, they will ask what you excell in and what you need work in, they will ask questions like "name a time you had to lead" or name a time you had to make a choice when a boss wasn't there. So be prepared for questions like this. One thing you need to think before you go in is "this job is mine" and be honest, ive gotten fired and I've never lied, they love that. Amd google appropriate attire for interviews, always over dress though.
Edit: and yes, yout def do need a tie and a nice suit, they look at the interview as more then just an employee but who you are as a person. My fiance is an ast. Manager and fast food chain she does all the interveiws.