Wittering: You I believe have it right all the way> I have been flying Glow for many, many years and still do but have now gone to electrics in past year. Still flying Glow as well as gas though.
Anyhow do your research extensively because electrics are expensive to start with so get the right stuff to start with. As been said, matching the motor, ESC, Battery, Prop is ALL important, also getting the proper charger for Li Po's. It is possible to to fly about any size aircraft you wish but o f course the larger they are the more costly everything is. I personaly stick to the 46 glow size or smaller for my electrics. Also believe it's good to go one size larger in motor size than what may be stated for any particular plane. That way you can fly at reduced power, which will be easier on battery but still have more power if needed. Most important to do as much research as you can and you will have success. Good luck.