Unknown villain, no stats.
1. Flatting PF fine?
2. C/R on flop fine?
3. Do we bet turn? If yes, how much?
PokerStars No-Limit Hold'em, $25+$2 Tournament, 10/20 Blinds (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com
MP1 (t1500)
MP2 (t1490)
MP3 (t1470)
CO (t3000)
Button (t1460)
SB (t1590)
Hero (BB) (t1500)
UTG (t100)
UTG+1 (t1390)
Hero's M: 50.00
Preflop: Hero is BB with A

, K
1 fold, UTG+1 calls t20,
4 folds,
Button raises to t80,
1 fold, Hero calls t60, UTG+1 calls t60
Flop: (t250) A

, 6

, 6
(3 players)
Hero checks,
UTG+1 bets t125,
1 fold,
Hero raises to t300, UTG+1 calls t175
Turn: (t850) 4
(2 players)
Hero checks/bets ?