Weird hand, I feel like i never know what to do when I flop a good hand on a flush board.

PokerStars - $0.50 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

SB: 68.32 BB
BB: 80.42 BB
Hero (UTG): 227.82 BB
CO: 144.06 BB <--- Villian in the hand, 36/18, AF2, 5% 3bet, 32% fold to cbet, only 500 hands
BTN: 68.48 BB

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Qh Ad
Hero raises to 2.5 BB, CO calls 2.5 BB, fold, fold, BB calls 1.5 BB

Flop : (8 BB, 3 players) 2c Ac Qc
BB bets 1 BB, Hero raises to 6 BB, CO calls 6 BB, fold

Turn : (21 BB, 2 players) 7d
Hero bets 10 BB, CO calls 10 BB

River : (41 BB, 2 players) Ks
Hero checks, CO bets 29.22 BB, Hero calls 29.22 BB

How would you handle the flop donk bet? I don't feel like I can let him see more cards for free, though I'm thinking the sizing could be smaller? Flop, just trying to charge draws and get value from Ax as well as KdX hands. On the turn, same thing, though he has more 2 pairs in his range to get value from. I didn't want to bet bigger than 1/2 pot to pot control against 22 and flopped flushes. On the river, I felt like he could have a lot of Kd type hands for bluffs with his value hands being 22, A2, AQ, A7, Kd7x, KQ, or any kinda small suited cards that flopped the flush.

He's kinda fishy (38/16), so feel like he could show up with a wider range, and not sure he's bluffing these spots a ton. Thoughts?