Well, I played with numbers, pot odds and such so I'll try and answer my own question and/or add a few more.
Let's assume that players at micro stakes are quite loose-passive and tend to call more often.
With only a naked nut FD it makes a lot of sense to check and try to see a cheap turn card to help define or hand because :
- By betting we would give ourselves bad pot odds to play our FD.
- Our implied odds that would be extremely low at higher stakes when a flush completes are actually still good at micros because our opponent tend to call a lot more (with lesser hands like straights, sets and lower flushes).
It's another matter if we have a FD + a made hand (two pairs or better) or a FD + backdoor outs/redraws. Our hand being a lot stronger it might be more profitable to bet a flop and decide the best action on the turn depending on the card that comes, our opponent(s) actions, stacks sizes, etc.
Basically :
- The more outs we have the more aggressive we can be regardless of the number of opponents in the hand.
- The less outs we have the more passive we wanna play our draw especially with two or less players in the hand. (For pot control and pot odds)
- The more opponents there is in the pot the nuttier we want our outs be.
I remind you that all this is assuming your opponent(s) are basically loose-passive calling-stations. Adjustments will have to be made with other types of players.
Is my thinking flawed ? I know it's all basic stuff but I'm sure it can be useful for lots of beginners.
Here is one of the things I played with this afternoon :

It's a chart of the number of outs you need to call a bet depending on the number of opponent that call this bet plus the size of the bet. Obviously it's not perfect because you rarely know for sure that they all will call and it doesn't take into considerations implied odds, but I was just playing around. Anyway, here is what I learned :
- You actually need a LOT of outs to call a bet larger than half pot.
- I should definitely give up my small draws versus a single opponent.
What do you think ?
Of course it would also be interesting to talk about implied odds (being less obvious, straights and sets have more implied odds than flushes for exemple, right ?).