First of, what do you do preflop here? Is calling a mistake? Is raising the right play? If yes, how big?

Next, what the hell is the correct play on the flop here? I simply have no idea how good I am with 99 in this spot, Button was fairly aggressive, but I've only been at the FT with him, so it's hard to tell if he just opened because we got shorthanded or if he's an aggressive player in general.

Any advice much appreciated!