21 Dec 2009 at 16:30 - 3
Basically, ignore the Mesmer part for now. It is too early in the game and you don't have enough attribute points to spread around.
Choose a main Necro skill line - Blood, Death, Curses - and choose the skills from mainly that line plus one other, if desired. You have only a limited number of skills at this point, but the game is easy enough that your "build" doesn't matter too much - provided you remember to bring henchmen, or other players, with you.
As you go on you will get a better idea of what sort of skills you like and how they work together. You are a long way from needing a "build" yet.