First read the FAQ which should cover most questions. If you want further info about enhancement spec check out
EJ.
And in short. You want a high crit rate and as much AP (preferably from strengh stats for BoK) as possible.
You'll also need enough stamina to survive AoE attacks and spells.
Crit rate should be around 30%
AP 1000+ (the more the better)
Also get the right weapons for optimal WF and SS damage.