Villains are unknown and I have no reads on them.

Turn
Given that we block the Jack, I suppose we have to mix between checking back and betting.
How often should we be betting compared to checking? What if we don't block the Jack?

Getting raised here is a disaster so checking makes sense in that situation.
Also, if raised, I think it's too hopeful to put villain on a turned combo draw
since not many players are that aggressive on these stakes.
However, if we bet, we get a lot of value from worse.

What do u think?