So I get that stormtroopers deploy with a group of three. I get that they EACH get 2 actions. What I am unclear on, is how much health each of the three troopers has. The card says three, but does that mean three health total (IE 1 health per trooper?) or three health each, (IE 3 health per trooper)?

3 health each.

Each of those three troopers is a separate unit that moves and fights individually, although they fight better as a team. It also means they die individually.

Feel free to give the demo vid a watch after reading the rules for the first time.

I think things will start to make more sense once you see the mechanics in action: