#1
Is it okay to move my forearm a lot when moving between strings when alternate picking? I find I use it a lot for changing strings, then employ my wrist for the individual pick strokes.
Call me Batman.
#5
It's better to use as little motion as possible, so your arm should hardly be moving. The most you should be moving when changing strings is your wrist.
Then learn to use your fingers as much as possible rather then your whole hand.
It'll help you play faster.