PokerStars - $0.20 PL Hi - Omaha Hi - 2 players
Hand converted by PokerTracker 4

BB: 350.25 BB (VPIP: 83.22, PFR: 32.87, 3Bet Preflop: 8.22, Hands: 149)
Hero (SB): 113.5 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K J Q 9

Hero raises to 3 BB, BB calls 2 BB

Flop: (6 BB, 2 players) 4 8 J
BB checks, Hero bets 3 BB, BB calls 3 BB

Turn: (12 BB, 2 players) Q
BB checks, Hero bets 6 BB, BB calls 6 BB

River: (24 BB, 2 players) A
BB bets 24 BB,

Firstly, do I bet turn? If so, larger than 1/2 is standard right?

Secondly, I get lead into in many unfavorable turns and rivers, and rarely on favorable ones due to an imbalance in my range. I chose this specific hand as I am lead into while holding the the nut blocker. With it, do I bet, call or raise?

I mean just fold, the rest of the hand is fine.

Flop: I don't like your sizing, halfpotcbets work best on static boards. Your bet is mostly a protection bet versus weaker pair + gs or something like that but these holdings will (correctly) call for 3BB. My standard here is checkback since I don't want to play versus a x/r and it's always a good thing to have some strong top-pair-type hands in my checkback-range. Keeping his range wide makes the turn play much more easier.

Turn: His range is somewhat wide, board is wet, your hand is strong but you have to protect it -> potbet. You don't want to see the river here since most rivers make straight-possibilities.

River: This is just the perfect spot for a bluff-raise. He may call with the J-high flush but it is ok, you will get a lot of folds.