Comments on flop bet size and river value bet size please. OOP, should I lead harder ($12) or check and see what odds they give me. Showdown is against a loose passive. No real reads on other two.

PokerRoom No-Limit Hold'em, $1 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($159.20)
Button ($122.10)
SB ($110.70)
BB ($85.50)
UTG ($25.90)
UTG+1 ($125.60)
UTG+2 ($99.00)
Hero ($109.10)
MP2 ($36.00)
MP3 ($66.70)

Preflop: Hero is MP1 with Q, K.
3 folds, Hero raises to $4, 1 fold, MP3 calls $4, 1 fold, Button calls $4, 1 fold, BB calls $3.

Flop: ($16.50) 3, A, 4 (4 players)
BB checks, Hero bets $10, MP3 folds, Button calls $10, BB folds.

Turn: ($36.50) 3 (2 players)
Hero checks, Button bets $10, Hero calls $10.

River: ($56.50) 9 (2 players)
Hero bets $30, Button calls $30.

Final Pot: $116.50

Or how about this river bet. Flop and turn chase are marginal, because I can't be sure if my J is good....

PokerRoom No-Limit Hold'em, $1 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($119.70)
SB ($367.35)
Hero ($105.50)
UTG ($18.00)
UTG+1 ($88.50)
UTG+2 ($42.00)
MP1 ($128.25)
MP2 ($103.50)
MP3 ($60.85)
CO ($19.00)

Preflop: Hero is BB with 7, J.
1 fold, UTG+1 calls $1, 1 fold, MP1 calls $1, MP2 calls $1, 3 folds, SB completes, Hero checks.

Flop: ($6) 9, 8, 5 (5 players)
SB checks, Hero checks, UTG+1 bets $3.5, MP1 folds, MP2 folds, SB calls $3.50, Hero calls $3.50.

Turn: ($16.50) 2 (3 players)
SB bets $5, Hero calls $5, UTG+1 calls $5.

River: ($31.50) T (3 players)
SB bets $5, Hero raises to $35, UTG+1 folds, SB calls $30.

Final Pot: $101.50

Last one is against a 36/2/1.38. Should I fear a flush enough to take this line?

PokerRoom No-Limit Hold'em, $1 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($263.40)
BB ($97.50)
Hero ($100.00)
UTG+1 ($76.40)
MP1 ($112.15)
MP2 ($95.50)
MP3 ($112.80)
CO ($129.85)
Button ($123.90)

Preflop: Hero is UTG with T, T.
Hero raises to $4, 4 folds, CO calls $4, 3 folds.

Flop: ($9.50) 8, 6, 9 (2 players)
Hero bets $6, CO calls $6.

Turn: ($21.50) 7 (2 players)
Hero bets $15, CO raises to $30, Hero calls $15.

River: ($81.50) 3 (2 players)
Hero checks, CO checks.

Final Pot: $81.50