I am wondering what break points are need for each of the main skills are need to be able to do end game content.

Like how much scouting will be enough to sneak by anything (so long as you follow the mechanics)

I have a few build ideas I want to do in the future and I want to be able to plan a head. 

37 atk while unarmed for com which translates to 44 com for tough with approperate traits,Wisdom is also 44 but firestaff is a significant power amplifier and has viability even at lower wis levels and for succubus build it doesn't matter(is sex experience and trait based mostly) but healer build needs at least 16 con if deepone 36 without deepone