[Elaboration]

"What do you put the button on, and what should my action be?"

First hand of the tourney, its really tough to say. He could have a 4 or a weaker A and he could be bluffing. Re-raising gives him a chance to get off a weaker A, while you're still smashed to a 4.
You are way ahead, way behind. Problem is, you are OOP. Still, I think I call and give him a chance to put more chips in on the turn.
If he checks the turn, I value bet the river.