1-I'm betting the turn, everything that's a made hand is calling and he doesn't have a strong hand. I don't agree b/f flop standard btw.

2- This is fine imo. He has more Qx than Kx, so if you think he'd fold like AQ to a river bet, I'd go for it. It IS BvB and you're probably barreling turn a decent amount, so I wouldn't count on much respect.

3- I don't agree on 3betting pre like others say.
I would rather c/r the flop. As played, bet more on the flop and lead turn for a big bet.
River is close, going with the assumption that a small bet like this is never a bluff I see why you folded, but after the action on flop and turn your range is so weak that I call this hand for this price.