AK Continuation bet

[JNash]

Party Poker No-Limit Hold'em, $10/20 BB (10 handed) FTR converter on zerodivide.cx
UTG ($2963.50)
UTG+2 ($2091)
Hero ($2027)
SB ($1952)

4th hand at the table, no info on any of the players.

Preflop: Hero is MP1 with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $10.
UTG calls $20, <font color="#666666">1 fold</font>, UTG+2 calls $20, <font color="#CC3333">Hero raises to $120</font>, <font color="#666666">3 folds</font>, SB (poster) calls $110, <font color="#666666">2 folds</font>, UTG+2 calls $100.

Flop: ($400) 3[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, UTG+2 checks, <font color="#CC3333">Hero bets $200</font>, SB folds, UTG+2 calls $200.

Turn: ($800) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG+2 checks, <font color="#CC3333">Hero bets $400</font>, UTG+2 calls $400.

Q1) Do you agree with contuation bet on Flop after 2 checks?
Q2) Do you agree with firing the second barrel on the Turn?
Q3) What's the best play on the river? Is it worth trying a bluff here? (I put him on 88 or TT based on the play so far.)