Most current coil heads have printed on their barrel a minimum and maximum suggested wattage range, example 50 to 120watts. If it isn't on the coil head barrel its on the packaging for the replacement coils.
However, as Topwater mentioned, there is no silver bullet setting for "Everyone" as "Everyone" has different flavor palletes, just a set of guidelines.
And this goes for fresh brand new coil heads
Start at lowest setting for the coil if it is printed on it or the packaging
After about 10 minutes bump it up about 5 watts, for about another 10minutes bump it up another 5 or so watts
You'll get to a point that you'll feel a dry or scratchy vapor, this will be the step before an actual scorched hit, back it down a notch of 5 or so watts, this will be the sweet spot for your palette, your juice you are using, and that coil, the moment you get a scorched hit, have to start fresh with a new coil you've burnt the wicking.