Congrats on your first step!
PC is an awesome tool, and when used properly can really show some great results. Additionally, it's really hard to mess anything up with it.
Only down side, is with 9 cars, you'r arms are going to fall off from the excessive vibration...
There's a ton of good articles about how to use the
PC, and generic machine polishing. There are some great videos here, detailersdomain, autogeek, and just on youtube!