Bleh! I suck at planning my bet sizes

Here's a simple example of me not planning my future bets properly:

$2/$4 No Limit Holdem
5 players
Converted at weaktight.com

Stacks:
UTG ($289.80)
CO ($558.90)
BTN ($351.80)
SB ($235.20)
Hero ($449.10)

Pre-flop: ($6, 5 players) Hero is BB :as: :ad:
1 fold, CO bets $14, 2 folds, Hero bets $48, CO calls $38

Flop: :9h: :jd: :3h: ($106, 2 players)
Hero bets $78, CO calls $78

Turn: :qd: ($262, 2 players)
Hero bets $168, CO calls $168

River: :qs: ($598, 2 players)
Hero goes all-in $151.10

Villain is a fish and I just want to get the money in on almost any board.

I usually bet between 2/3 and 3/4 the size of the pot on the flop. However, this always seems to leave me with a stack about 1.25 times the pot on the turn.

What do you guys think is the best bet sizing for spots like these?

if you have Ah I like half pot on flop-turn then shove riv

on this board I like your bet sizing. he s not paying attention to it, that s for sure...

i think this is fine. vs a reg i would def bet less, but given hes a fish this seems standard to me.

I always like this bet sizing against fish, for some reason it allows them to call the river with any 'ol junk when they miss their draws.

I just ship the turn even though it's 1.25 or wtv. He's never folding combo draws or pair + draw.