1) Don't discount limpers just because they didn't raise. I've seen people limp in EP with big pairs or hands as strong as AK / AQs. Plus you don't want to get reraised or cold-call behind by monsters I will fold those speculative hands unless limper is bad and/or table is passive, and then I might limp along.

2) I often find ccall flop-lead turn is usually not a strong line. Raise turn.

3) Passive nits often just flat your lead with one pair (even AA unimproved) even on a drawy board. If you're raised you are most often against a set and so adjust your pot equity accordingly. And no I am not comfortable going AI on flop with a naked FD.

4) Regulars only play OOP with good hands for example pocket pairs/AJs+/KQs. It's much more likely they have a set than some kind of draws. Easy check behind on turn. OOP you're in a much tougher spot.

5) TPnK from the blinds I usually check flop and lead out a benign turn/give up on a scary turn. Draws I like to lead flop, sometimes 3-bet them.