1. Are all pistols holstered at the start?
It's my understanding that pistols are always holstered at the start of a scenario unless specifically stated otherwise.
2. I'm guessing that the Commadore Owens player needs to chose to either start with the pistols holstered and use his rifle at the start or be using both pistols instead?
I believe you must decide which to use at the beginning. And using both pistols is a variant, right?
Does the card "Fall" only work if your opponent choses to move on his turn?
I think you can play the "fall" card whether or not the opponent is moving.