FIFRST FAST FOOD INTERVIEW, HELP PLEASE!!?

i just got a call for an interview in 5 hours! what kind of question should i ask? it's a fast food restaurant, pretty small, and it sells pretzels XD. also how should i dress? (i'm 14 btw) is jeans not okay? cuz they're the only pants i have besides sweats.. and how would a gray cardigan and a simple shirt underneath be? what should i look out for? help please! and thanks!! :D