How many watts to get good flavor? 8w ~ 120ish depending on too many variables to even discus in less than a couple dozen pages. Mostly it is a matter of personal preference. You can get excellent flavor using 8w just like you can get excellent flavor using 100+.
Which atty/ mod / coil build are best for flavor? Again mostly a matter of personal preferences.
No one can tell you what you will like, we can make suggestions but that doesn't mean you'll like what someone else uses or even be able to get a half decent vape from it.
I'm not trying to be rude but you don't seem to understand the answers & opinions you've already received.
You've asked these questions over & over & over in multiple threads and received many very good answers, opinions and recommendations.
After reading all your threads I suggest starting off with a more simple set up until you gain experience, understand how stuff works and form your own opinions about what is good, better, best for you.