Pocket kings

[just2fast]

Hello,
I'm brand new to poker, started playing and reading last week. I've played about 2000 hands total. I would have to rate myself tight/passive. I'm working on the aggressive but I want to know what I'm doing first. So far I'm up about 10 bucks on ps and full tilt .25/.50, but it takes a long time. I tried .2/.4 and it seemed more like a long drawn out game of war, but I don't know what I'm doing yet. I just finished the hand below and wanted to get some feedback on playing it. Thanks for any input. I've lost with kings more than I've won with them.

Thanks for any advice you can give.

The CO is a very tight player, 10-20% hands. UTG is new to the table.

Full Tilt 0.25/0.5 Hold'em (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP2 with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">CO 3-bets</font>, Button calls, <font color="#666666">2 folds</font>, UTG folds, Hero calls.

Flop: (11.40 SB) 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Button calls, <font color="#CC3333">Hero ?</font>, CO ?, Button ?.