NL100 - 777 played really weak

[DandyJam]

Ok, I screwed this one up by not betting the turn, right? What's your line here? If you bet the turn, how much and how do you react to a raise? How big of a river bet would you call if your turn bet is called?

Villain is 40/14/1.9 after 100 hands.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $196.90
UTG+1: $220.95
CO: $142.85
Button: $109.45
SB: $352.40
Hero: $100

Pre-flop: (6 players) Hero is BB with 7[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/spade.gif[/img]
3 folds, <font color="#cc0000">Button raises to $3</font>, SB folds, Hero calls.

Flop: A[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] ($6.5, 2 players)
Hero checks, <font color="#cc0000">Button bets $5</font>, <font color="#cc0000">Hero raises to $15</font>, Button calls.

Turn: 6[img]/images/graemlins/spade.gif[/img] ($36.5, 2 players)
Hero checks, Button checks.

River: T[img]/images/graemlins/spade.gif[/img] ($36.5, 2 players)
Hero checks, <font color="#cc0000">Button bets $30</font>, Hero folds.
Uncalled bets: $30 returned to Button.

Results:
Final pot: $36.5

[Thremp]

Lead flop, 3bet if raised. Pot/shove turn.