Cosync, It is very good and important to learn about how these types of things work. "Just keep it in the green" is a mentality that will get you killed, if you ever fly a real airplane. I also fly a plane with a constant speed prop (Cessna R172K...aka Hawk XP). The whole idea of manifold pressure, prop setting, etc can be quite confusing when you're just beginning to fly constant speed prop aircraft or have not yet flown them and it is really good that KAUS is trying to find out what they're all about.
KAUS, you'll find there are quite a few "rules of thumb" for operating constant speed props. Such as the square rule and multiple cycling of the prop during runup to flush oil in and out of the prop hub. You'll also find that only some of these rules of thumb are applicable to the aircraft you fly even though they are all often taught as fact. Quite a bit of it has been passed down from the days of flying B-17s and P-51s and just doesn't apply anymore. Be sure to look in your POH for whatever aircraft you fly and/or talk with a qualified and knowledgable instructor about how to properly operate the type.
Moving to higher performance aircraft can be quite a thrill. It'll make your basic 172s seem like less of an airplane and make it so you hate flying a 152