2/4 flop straight, how to bet out?

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this is prolly the worst played hand in my ptdb, after i checked the flop and then there was a lot of action on the turn, i didn't know how to respond...help please

1 what kind of bet should i lead out with on the flop?
2 should i have expected anything less than (see the white) with this betting sequence?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $2/$4
5 players
Converter

Stack sizes:
UTG: $414.20
n00b: $517.50
Button: $420
SB: $130
BB: $426

Pre-flop: (5 players) n00b is CO with 4[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/heart.gif[/img]
UTG folds, <font color="#cc0000">n00b raises to $14</font>, Button calls, 2 folds.

Flop: 2[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] ($34, 2 players)
n00b checks, Button checks.

Turn: 4[img]/images/graemlins/spade.gif[/img] ($34, 2 players)
<font color="#cc0000">n00b bets $16</font>, <font color="#cc0000">Button raises to $76</font>, n00b calls $60 <font color="aaaaaa">(pot was $126)</font>.

River: 8[img]/images/graemlins/club.gif[/img] ($186, 2 players)
n00b checks, <font color="#cc0000">Button bets $184</font>, n00b calls $184 <font color="aaaaaa">(pot was $370)</font>.

Results:
Final pot: $554
<font color="#ffffff">Button showed 7c 5c</font>
<font color="#ffffff">n00b mucks 4c 5h</font>