As we know: Whirlwind, Siesmic wave, Rolling crash or Rising blade and Cascade break are the most important PvE skills for a WA. So we would put level9 (Cabal Alz) Whirlwind and Siesmic, and level20 RC or Rising blade same for Cascade break.
But you'll have to level (Cabal Online Alz) up quite a bit before you get those skills, so you would just get the skills youi need, and level them up to 9, until you could get definite skills. And it is very easy get all skill you get to level 9 I mean sword atack skills.
You can get a nice set up for combo and just level on because later you get beter skills and beter when you become high. So then you must get rid off some low level skills. Also level 9 skills have the fasest cool down.
When your rank is master you get skills you need to keep til rank Trans in Cabal, a Warrior is not so good in pve ad low level skills are not that great. When you get G master skill you are master in AOE and you get more AOE skills that blow them away.