Security Officer Question: How to ask for work as part-time?

Well, you see, this is my first time to this. I'm in college for night class and I just want to have a part -time job as a security, I still have to go for the 8 hour training and the OJT. However, today when I got to my application they said: "why do you want to work mon-friday and first shift only?" and I said " because my schedule preference needed that." and then he said "well, on this job we work 24/7, so if you are like that, then this is not a place for you" VERBATIM! he said that. I just stopped and thought about what to say there for a bit but I was kinda ticked off with his smart comment (I don't like smart sh*t like that, I got too much already when I was in the Army.) Don't know if he's just a d!ck or he's the actual shift supervisor. But I'm starting not to like him, he make it sound like he does a bad-as job of making the american people safe everyday. (c'mon now, we know security job is not a deterrence for crime mugs? heck, unless I got trained as crowd control then hell yeah.)

I did not tell him I go to school or something because they are kinda in a fast-paced-apply-for-now-and-verify-background-mode at that time. But I wanted to tell him I only wanted a part-time job not a full time.

Anyways, So, they said.. they'll call me back later after all the background check and formality and they did.

Told me to be on the guard office tomorrow afternoon to talk more about the job.

So is that gonna be my actual interview for tomorow? or I just had one today?

Coz I'm quite confused right now because the guy who supervises recruiting thinks I should work 7 days without off? or he's just a recruiting manager and there's an actual place where I could choose where to go as a guard, choose/change shift and decide whether to work part-time or full-time?

How do I ask then to have a part-time job schedule? like a way to say it right?

Also, Do I have any advancement chance to become like one of those bodyguards or anything a lot better than just a armed/unarmed guard without going to be a Police? Kinda still kick that movie called Body guard too. :)

Any help, suggestions,comments, negative reactions...etc is much appreciated. Thank you much.