Free wheelin' vs cold caller

All joking aside. I have no idea what i'm doing here.

BTN: 173.4 BB
SB: 104.2 BB
BB: 184.2 BB
Hero (UTG): 120.4 BB
MP: 130.8 BB
CO: 100 BB

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has A♠ 9♠

Hero raises to 3 BB, fold, fold, BTN calls 3 BB, fold, fold

Flop: (7.4 BB, 2 players) 7♥ 5♥ 6♣
Hero checks, BTN bets 4.6 BB, Hero calls 4.6 BB

Turn: (16.6 BB, 2 players) 4♦
Hero checks, BTN bets 8 BB, Hero raises to 24 BB, BTN calls 16 BB

River: (64.6 BB, 2 players) 3♦
Hero bets 41.4 BB