Welcome to the forums! I'm in a very similar position to yours, but I do a lot more personal repairs (ie, I rarely use remote connections. Since I'm so close to all the computers I fix I can either just walk down there or drive if it's at another school)
I work at an elementary school as IT Support so I probably work with a few programs very few people have experience with (database management for school programs such as the library checkout system, e-book rental systems for teachers, math and reading program student databases, Aeries (the main student database), etc, etc, as well as security systems for checking for sex offenders and the like)
It's an adventure every day, and I enjoy every bit of it. As the old saying goes, "do something you love and you'll never have to work a day in your life"
From experience, my first tip would be get things done as fast as possible. They'll love you forever