If I'm running more than 1 commander, do I put all of each commander's command cards in the command deck? Or is it always at 7 cards and I choose what 3 cards from each commander I put in?

Can an opponent ask to look at your command deck? Is that open info like your army list?

Your first question is answered on page 5 of the rules reference.

Your second question will probably be answered when the organized play rules drop

2 hours ago, Ken on Cape said:

If I'm running more than 1 commander, do I put all of each commander's command cards in the command deck? Or is it always at 7 cards and I choose what 3 cards from each commander I put in?

Can an opponent ask to look at your command deck? Is that open info like your army list?

In the meantime I would think you can see a command deck before play, and you can see their played cards during play.

To clarify page 5 RRG says you must have two cards for each pip count 1-3 (no duplicates), plus Standing Orders. Rebels can only do this one way right now, but Imperials and soon Rebels will have multiple options to fulfill that requirement.