First off, know that I work at Subway (sandwich place), so depending on what job you're getting, it might be more serious.
1. When I filled out the application for my current (and 1st) job, I just left the whole place blank.
2. I dunno what kinda questions wouldn't apply to you, but go ahead and put N/A to let them know that you read and understand the question.
3. Oh man tries to remember what he was asked last year in the interview .... my manager asked me questions such as "Name one example in your life where you were forced to take initiative of something" and weird stuff like that. I just made up a bunch of bullshit since I couldn't think fo anything, and it worked fine.
He'll probably ask about your transportation situation (Bus/car/walk/bike?) and if you can be reliable enough to show up to work on-time.
My manager also asked me about school (I had just dropped out at the time, so he asked me why I dropped out and things like that). If you have good grades, talk about those since people like to hire people with good grades (makes them smarter than someone like me or some shit).
I don't think you need to take a class or anything to figure out how this works. I had no idea what to expect and I just played the whole situation calm. When I walked in someone told me to have a seat and wait for the manager to come out.
When he came out, I got up and shook his hand and didn't sit back down until a) He tells you to have a seat or b) He sits down first. Little things like that go a long way (I think).
Other tips: Don't look around, rather look at the dude (if you're shy, just do it. I'm shy and I did it, too) when you're talking. Try to talk with proper grammar (I didn't, but my manager didn't seem to mind) and don't say "uh" or "um" all the time (best if you don't ever say it).
I'll post more as I think of more. Hope this helps.
The mentality I had when I walked itno the interview was: "Say what he wants to hear". That's what I did.
Oh yeah, if you're working at a restaurant, you'll probably be asked what you do when your friends come in the story. Do you greet them and talk to them (therefore disrespecting customers) or do you treat them like any other customer (obviously the latter) ?
Also, you'll most likely be asked about stealing (or how you feel about it). My manager made a point of telling me that "sweethearting" (which means hooking people up with free stuff) can get you fired ASAP, so yeah.