AK first level with multiple callers (16 turbo)

Bet size here?
Line for rest of hand?

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO (t1445)
Button (t1445)
SB (t1445)
BB (t1500)
UTG (t1500)
UTG+1 (t1500)
MP1 (t1500)
Hero (t1500)
MP3 (t1665)

Preflop: Hero is MP2 with A, K.
UTG calls t20, 2 folds, Hero raises to t80, 1 fold, CO calls t80, 1 fold, SB calls t70, BB calls t60, UTG calls t60.

Flop: (t400) 4, 2, A (5 players)
SB checks, BB checks, UTG checks, [color=#CC3333]Hero ?

I like 100 to go preflop with the limper in front. Just helps to thin the field a bit more.

On the flop, I am betting full pot or close to. If called I am getting it all in on a non turn.

Yeah, PSB with that many people seeing the flop.