Missing the flop

[Atropos]

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter

Button ($36.4)
SB ($71)
BB ($55.07)
UTG ($341.9)
Hero ($211.1)

Preflop: Hero is MP with A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.5.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $4</font>, Button calls $4, <font color="#666666">2 folds</font>.

Flop: ($9.50) 3[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $5.5</font>, Button calls $5.50.

Turn: ($20.50) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $15</font>, Button calls $26.90 (All-In), Hero folds.

Final Pot: $62.40

Sorry for preflop play, ATo sucks in NL and OOP it sucks even more. It was sheer stupidity.
What should I do at the flop/turn?? Button was very passive and often calling down top two pair/stuff. I felt he would fold if he had no flush/monster, thats why I bet the turn...