Lesson No.1 , you do not play l2 with 1 window (aka character). Boxed ISS is essential if you want to save time and progress in this game. I wont outline all the reasons here just trust me on this.
The class you playing is a 1:1 pvp toon vs legit players )) I will not comment further on this topic also imo it's dark area.
And as guy previously mentioned , if you like wizards ... play Feoh. Its decent more less everythere pvp , sieges , exp. Maybe just get 1 shoted by othels , and archers just that.