$27 turbo on stars top set on a scary board.

This hand took place at level 1 so blinds are 10-20. Only the second hand of the sng so I have no real info on any of the players in the hand. UTG+3 calls for 20 chips he has 1500 chips before the call. Folds around to me holding QcQs I raise to 100. It folds around to the BB who calls UTG +3 also calls. The pot is 310 right now. Flop comes 6h8hTd. Checks around to me and I bet out 280. BB folds and the other player calls. Next card comes Qd giveing me top set. The other player checks and I bet 400 into the 900 pot. The other player calls. The river comes 9d making a possible flush and a possible straight. The other player pushes all-in. What is my play here? How often does he have a underset, 2pair or a overplayed AA or KK and how often does he have a straight or flush and is he ever bluffing a missed flush draw here? Also did I make any mistakes on this hand? Thanks for any help.