New to NL100 so no reads

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) from (Format: Bet The Pot)

Hero ($105)
MP ($52.35)
CO ($53)
Button ($109.80)
SB ($100)
BB ($217.60)

Preflop: Hero is UTG with , .
Hero raises to $4, 1 fold, CO calls $4, Button calls $4, 2 folds.

Flop: ($13.50) , , (3 players)
Hero bets $8, CO folds, Button calls $8.

Turn: ($29.50) (2 players)
Hero checks, Button checks.

River: ($29.50) (2 players)
Hero checks, Button bets $9, hero???

He probably has a busted flush draw and unlikely to have a 6 unless he played 56 or something. Do I save the money for another day, call, raise, push?

Call. More than 4:1 that he's bluffing and the only bluff you can't beat is AQ. AK's doubtful here. The check down on the turn opens up his range so much to fire the river in position.

Good check on the turn BTW. With no reads, I don't like double-barreling this rag.

Bet 10 into that flop with 2 callers OOP. Easy call on the end with those odds.

I wasnt sure if he made a pair of sevens or something on the river so I min raised and he folded. Min raise a bad idea?

YUP!! Think of what folds that beats you vs what calls that you beat and what % of the time he folds. The only value in raising is if you think A high isn't good enough, but that he'll fold something that beats you.

Horrible check-min-raise on the river. Check call or put in a real raise - you made the absolute worst play possible, besides turning over your cards or mucking them.