What should i do?

I just got a job interview scheduled for tomorrow at 2:00pm at Smitty’s restaurant. When the guy phoned me, one of the questions he asked, i couldn’t quite understand, but i just said “yes…” and when i was about to ask him what he just said, he said “oh really? okay” and continued asking more questions, so i forgot to ask him. I think he said something about a scholarship, and if i have one or not, I don’t have one, and… i’m not sure should i phone him back, or go for the interview and ask him what he had asked me at the start.. or end? How old do you have to be to work at Smitty’s? I’m only 15 but turning 16 in a few months.