AK on kjx flop- in 1st major tourny

pcaific 100+10 717 players, 4th round (BB=100):
hero (t3800) raises 3bb (300) utg+2 with Ad Kc, CO raises to 500, SB calls, hero calls, pot= 1600.

flop: Kd Jh 5s
SB checks, hero bets 900, Co folds SB calls

Turn: 2d
SB checks (fast, t1600), hero goes allin.

it's my first tourny for such stakes, no clue on the "right" moves.
any critic of my play? thanks!