1. Think of certain flops. Think of the range of hands that would fold from your original range and what would continue. Think about if certain turn cards would make any of that range fold after calling a bet on the flop. Think about what effects bet sizing does to their range and start manipulating them with your sizes. Start categorizing your flops so you don't have to come up with every single flop combo and think if certain categories are better betting out at / double barrelling. I will tell you this, if you intend to bluff, you should rarely do it against tight ranges. But if a large % of hands fold from their original range then by all means bluff. This is why having notes and knowing players' tendancies on exactly what they'll continue with is so crucial.

As far as the drawy board thing, please give an example. But in most cases you should elect to b/f. Sometimes it's better to just check on the flop if the board is really drawy and we hold something with good showdown value yet is vulnerable.