A few questions about getting a first job?

I am a 17 year old who recently finished high school and wanted to become employed over the summer. Iv'e never held a job before, so I had a few questions about the process. First of all, I'm moving away for college in about 2 months, is that something I should mention, especially if I want to include that employer as a previous employer when I move elsewhere? I feel as though a lot of people won't bother to hire me if I tell them I'll only be around for 2 months, but at the same time I figure that lying would be a bad idea if I want them to say good things about me when I include them in my previous work experiences in the future.

Additionally, I don't really understand references. What kind of people should I include? I've never had a job before, so past supervisors/coworkers are out of the question. Would teachers and extracurricular coaches be a good idea? They are kind of the only people I can think of. And what is the proper way of going around and asking them?

Thank you.