As a werewolf imperial nightblade, you'll have a lot of things working for you. Mainly crit chance and damage. For attributes, I reccomend getting yourself to 20k health and the rest in stamina. In werewolf form you get a boost to max stamina anyway.
If you want sets, I ran Hunding's and Marksman. The regen and cost reduction from marksman helped offset the high stamina consumption from werewolf. Bonus points if you have vicious ophidian to replace marksman.