I would appreciate your input on how to play a hand like this. Basically I do not know what line to take - and ended up as a calling station.

I am in the SB with
Villain is OTB and is an aggressive guy that have been stealing my blinds a lot, and rasing a lot in general. Something like 20% raises and 30 VP$IP
BB is a very loose donk playing like 60% of his hands
Villain and me both have 100

Villain openraises to 4$, I call, as does donk.
Question: Should I fold, call or raise here? Would I like to create an even bigger pot with a SC OOP (with a raise), or should I wait for a better spot to play back?

Pot is 12. Flop comes
Checked to villain who bets 7, I call, and donk folds.

Should I lead out here? Or CRAI as I should be 50/50 vs a paired hand and there should be some folding equity, since it could very well just be a normal CB with air - and I even might get AJ or KQ to fold. His range is pretty wide. Do I really want to put that much money into a pot that is still so small for a 50/50 shot?

Pot is 28. Turn comes .
I check to villain who bets 14. I call.

Question. Should I call here? His bet seems weak, and I hardly need any implied odds to make 15 outs good? I am assuming he didn't doesn't have JJ or KK. Should I raise since his bet was so weak?

Pot is 56. River comes .
I bet 35, villain calls.

When I hit the obvious flush, I cannot check since he would most certainly check behind? Should I bet more? Or should I just hope to check it down since the only hand that would call a bet on that flush board is a hand that beats me? But I cannot be afraid of a Boat or higher flush here, since his ranhe is so wide from the button?

Thanks for the input. I think these type of hands are really tricky. And I tend to go into a passive calling mode.

In this case the guy had AK, so he actually had a good hand. But more often than not he would do it with air, and there I think a CR on the flop would be a good idea.