For PvP Necro, you would want to max Bone spirit, Bone armor, and stack on lower resist, poison nova, etc etc.

Max dex for blocking if you're going to fight zon/melee, no need for dex if you're NvN.

Str for equipments, rest in Vita. No point in energy.

You'll need a lot of fr/w (with mana), and maybe bone/poison GC with life or fr/w.

You will have a point in CE, AMP, and some LR. Use that on Cows, 1 points would really be enough, and enough to be effective. Necros are one of the best characters to play in Cow level.