Multi-way pot 2 flush on board vs. TPTK

[LockLow34]

Here are my thoughts:

How would you play it?

Question 1:
How much to bet if it's checked to you?

I'd underbet the pot by about 1/2 if you think the player will chase you for his whole stack. Basically you don't want to get all-in and lose to a suck-out if the flush comes on the turn.

Say you bet and get at least 2 callers and suspect at least 1 is drawing to a flush...

2 things can happen on the turn:

1) the 3rd flush card comes

Question 2:
What do you do if it's checked to you again?

I'd bet the same amount I bet on the flop. If I get check-raised or flat called, my plan is to check behind on the river.

Question 3:
What do you do if you bet out and are check-raised?

I'd give it up here to a large check-raise. Chances are he's got you beat, if not with the flush then with 2 pair or a set.

2) the flush card doesn't come

Question 4:
How much do you bet?

Here I would slam it home. If he wants to see the last card it's his stack. If he's been slow-playing a set (how likely is that on a 2 flush board in a multi-way pot? you'd most likely get check-raised on the flop) more power to him. Bad players chasing a flush or holding weak aces will almost always call (and lose). Smaller pocket pairs will likely fold.