When you level up to 41, this is my favourite build for pvp.

Aimed - 5/5
Nox - 3/5 - 1,4,5
Piercer - 2/5 - 1,4
Medic - 5/5

Passives
Dex - 5/5
Str - 5/5
Int - 5/5
Damage - 5/5
Crit - 5/5

How you distribute your skills varies with different playstyles but I would advice putting a few points in int and str as opposed to a pure dex build.