AK, first hand on the table.

No reads on villain.
Howz my line?

Party Poker No-Limit Hold'em, $ Hero (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG+1 ($53.33)
MP1 ($49.75)
MP2 ($49.50)
MP3 ($67.90)
CO ($156.18)
Button ($16.03)
SB ($36.13)
Hero ($50)
UTG ($124.40)

Preflop: Hero is BB with K, A. SB posts a blind of $0.25.
5 folds, CO calls $0.50, 1 fold, SB (poster) completes, Hero raises to $1.5, CO calls $1.50, SB folds.

Flop: ($4.50) 3, K, T (2 players)
Hero bets $3, CO raises to $6, Hero calls $3.

Turn: ($16.50) 4 (2 players)
Hero checks, CO bets $5, Hero calls $5.

River: ($26.50) 6 (2 players)
Hero checks, CO bets $10, Hero calls $10.

Final Pot: $46.50

The only hands you are behind with a reasonable player on that flop are 33 and TT. Reraise the flop,especially with 2 spades out. I really think he nailed a spade on you. His turn bet looks pretty weak. A healthy raise on the flop or turn is in order.

I'm not calling that river into that pot, but I'm not letting it get that far either. AI on the turn.

That seemed ok, although that river and bet is a little scary, but maybe he's playing your weakness. My line with that board and no read would be call flop and lead 1/2 pot on the turn, folding to another raise. The turn lead avoids a free card and gets a little more and value from worse pairs and info then check/call. Villain's weird 1/3 turn bet doesn't make sense for a flush draw, unless he's a donk...prob a worse K or maybe a 2 pair/set.

I would have folded if he would have bet more,but i can't just fold a bet of half the pot on the turn/river.
If he shows a better hand then good for me,i just take a note.

I raise to $2.50 pre-flop. I probably bet turn for 1/2 pot and fold to a raise. As played I think your turn and river calls are fine. I put villain on an underbet set or KQ here. With a flush draw I don't think he makes that weak turn bet... he either checks behind or tries to take down the pot.