Two pair against possible flush

[AvH]

Party Poker
Limit Holdem Ring game
Limit: $0.25/$0.5
5 players
Converter

Pre-flop: (5 players) Hero is BB with A[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/club.gif[/img]
UTG folds, CO calls, Button calls, SB calls, <font color="#cc0000">Hero raises</font>, CO calls, Button calls, SB calls.

Flop: A[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (8SB, 4 players)
SB checks, <font color="#cc0000">Hero bets</font>, CO calls, 2 folds.

Turn: 2[img]/images/graemlins/diamond.gif[/img] (5BB, 2 players)
<font color="#cc0000">Hero bets</font>, CO calls.

River: 2[img]/images/graemlins/club.gif[/img] (7BB, 2 players)
Hero checks, <font color="#cc0000">CO bets</font>, Hero calls.

Results:
Final pot: 9BB

Is my turn bet good? How would you, without stats on your opponent, respond to a raise? How about the river check-call?