Not to hi-jack but It couldn't hurt for me as well to learn something from this thread, although I do know some basics how to use a rotary even though I don't own one.
1) whatever your technique is and what your comfortable with and still get excellent results, stick with it. Your technique and your results will tell you what's right for you. This is kind of a personal preference thing.
2) Keep the buffer moving, never stop to itch your arm or something and hold the rotary with one hand while still the machine is still on and against the surface.
3) Arm speed. As you speed up the buffers RPM, you need to increase your back and forth arm speed as well so you don't burn the paint and keep an even surface temp throughout the panel your working on.
4) Check out Meguiars video "How To Remove Paint Defects" It actually shows you how to use a rotary. Gives you an idea of what to do and what not to do
Those are just some basics I know. If I was experienced with a rotary I could tell more. Hopefully this should at least get you moving in the right direction,,,,,,,AR