These hands in unraised pots gives you a decicion on every flop - especially when checked to IP. You must consider a few things:
1. The flop texture
2. Amount of players in the hand
3. Your hand
4: Your opponents
5: Your fold equity
6: Which action now? - if bet, which amount?
There are probably more, but these are all I can think of as I write this, will add more if I find something.. Now to answering my questions, I will use the posted hand as an example:
1: This flop is partly coordinated - It got a flush draw and an unlikely straight (draw), with only one high card.
2: 3 players besides you - you are last to act
3: Flush draw - not the nut draw, but still a quite strong hand if you hit one of your outs
4: This is of course individual - You should note how far the villains tend to go with their draws, which hands they call down with, raise an unraised pot on the flop with and last but not least, how often they fold to a bet on the flop and how often they c/r.
5: This can't be answered directly, but you must combine the answers in question 2 and 4 and try to estimate a value - on this board you got quite good FE generally since people witout an ace or the flush draw will nost likely fold their hands.
6: You really only got two possible actions: bet or check, so letss look at the pros and cons of each:
Pros:
check:
- 3 villains (which decreases the chance that you take down the pot directly)
- You get to see the turn for free
- You avoid getting c/r'ed
bet:
- You have a good chance of taking down the pot
- You take the initiative
- You start building up a pot (will be useful if you hit your draw)
- You get information about how you stand
- You will get some weaker hands out (maybe some stronger too).
Well, I don't wanna list all the cons, most are obvious and you can already see that you gain alot more by betting out, so that will be our action here, now which amount? As always this depends on the board texture and as answered in q1, this flop is partly coordinated, which should make your bet around 3$ - Maybe a tad more, since we are 4 players at the flop, but still: Around 3$ would be the right thing to do.
Now you may risk a c/r but I won't tell you what to do if thats the case right now, already wrote enough I think 
As always: I'm here to learn as well, so don't take my words for granted, but think it through yourself and come to your own conclusion 
Best regards,
Mugge