A set on 4-straight board

[MicroBob]

This river sucked and I'm really uncertain of how to proceed in such situations.

Villain is 64/26/1 after 35 hands.
I've been reading on here instead and haven't paid attention to him other than his stats.

Party 5/10, 6-max, 6players
I have 77 UTG and raise.
MP cold-calls.
Everyone else folds.

2 to the flop
752r

I bet, opponent raises, I 3-bet, opponent calls

Turn is an 8 completing the rainbow.

I bet, opponent calls.

River is a 6.


Check/call?? Bet/fold?? Bet/call a raise??


I know this stuff happens all the freaking time but I don't think I am approaching these types of situations correctly.