The Kodak website has a wealth of publications about film and film handling:
http://www.kodak.com/US/en/motion/newsletters/index.shtml
http://www.kodak.com/US/en/motion/support/index.shtml

Plus Film-Tech has had many threads on projection training. And check out the Film-Tech Manuals and Tips sections.

Hopefully when you apply for a job at a theatre, demonstrating some level of knowledge and technical aptitude will put you in the booth. On your resume, list any courses, hobbies or work experience with photography, moviemaking, or electronics. With some luck, you will work with a skilled projectionist willing to share knowledge and teach you the art and science of good projection.
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John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

Then read all the posts in this forum. Then ask your questions. You are starting from way back in the field and this forum is for people in the industry.

Emulsion is what makes the image on film. Like a written page, the Base is like the paper and the Emulsion is like the ink.

Keystoning occurs when the angle of projection is anything other than 0 degrees on center. In other words if your projector is too low or too high or too much to the left or right, the image is distorted. A square will look like a Keystone in a Roman arch narrower on one side and wider on the other.

One of the first rules of a forum or online discussion group is to read for a while without speaking. Learn what is being said, then and only then should you feel that you can contribute something. I would look like an ass, if I stood up at the Technicolor Electronic Cinema rollout and ask, “Oh, what’s a pixel? Duh!”

I stood up at a meeting called The Primacy of Exhibition to ask if there was a perceptual difference in the mind between film flickering at 24 frames a second and the way video is scanned. Somebody else asked the same question, I didn’t then ask it again to hear myself talk, I just handed in the microphone, sat back down and listened to the answer.

Listen, don’t speak!

NOW LET'S SEE IF IT ACTUALLY HELPS!

They have a full blown performing arts center with stage and all. A lot of the staffing needs are filled in with Work Study students. Once the year's new "crop" of students has settled in a couple of them are invited to work in the booth. So, not only do you get to learn how to be a projectionist you get PAID for it!
If you turn out to be good enough, you can apply to the local Cinemark theatre and have pretty good chances of getting hired.

Here is some information on projection:
http://www.kodak.com/US/en/motion/support/h1/projection.shtml

Here is a glossary of terms:
http://www.kodak.com/US/en/motion/support/h1/glossary.shtml

As Ian said, back issues of Kodak's "Film Notes for Reel People" and "Cinema Notes" have quite a few articles about projection technology. They are in the Film-Tech "Manuals" section. Film-Tech's "Manuals" and "Tips" sections have LOTS of information useful to budding projectionists.

One of the guys I worked with was involved with restoring the local downtown movie theater, The Lyric, and he got me involved, and that's where I learned 35mm. Check out the AV department where you go to school, hopefully they will be able to help you out and give you training.