I'd chk back the flop most times unless villain is unknown with my weak kicker 2nd pair. Am I betting for value or am I bluffing?

As played I'd definitely bet the turn as well unless of course villain is a station, then, see above.

River sucks but if you think this is a bluff be my guest and call it.

It looks like a better 9, more likely pocket 5s, maybe Q9 or lsowplayed QQ, but imo the raise river on that board is fine.

Nice fold imo.

I don't think the line is too bad.

This isn't a standard open from the CO though, but it's close.

Flop is close between a c bet and a check. I would probably bet but maybe check behind with TT.

Once you bet the flop I think I'm betting the turn as well, there's a few draws out there and we protect against any floats which have equity, allowing us to check behind on the river.

I think a river raise is good but you made it too big imo. There's not a lot of worse hands ever calling, he rarely has a worse 9x. As played the fold is good.