M,

After you get past the stiff arm phase you will probably find a position for your arm that feels best for you. At that time you may need to consider "bias" in the handle setup. If you hold a handle with your wrist positioned for equal movement up and down, note that the handle is not vertical but tilted forward. If you fly with your arm straight out, you will need to adjust your handle so it is tilted to match your wrist movements so you have equal movement up and down. If you hold your arm with some bend at the elbow, and your wrist at chest height, you may find that the handle is now vertical with your wrist positioned for equal movement. I recommend the bent elbow, but find what works best for you.
I was taught to fly inverted with my wrist palm up. Experts say this is wrong and limits your movement. I would suggest learning to keep your wrist the same in both upright and inverted flight. As mentioned previously, it is a hard habit to change.

George

Edit: Some learn to fly inverted after inside loops by learning to do "lazy eights". You start an inside loop and, as you are going down, give it down elevator as if you were doing an outside loop and fly it around for part of an outside loop, then bring it out to level (upright) flight. As you learn these, extend the inverted part where you go into an outside loop until you do a lap or so before returning to upright.