There are two variations on skills for werewolf, the gnash weave build or the channeled claw fury build (the werewolf 'beam').
Gnash setup is on the Zenkosh and Fury is on the Fury build (duh). Zenkosh should be using Gnash but the full DD setup with savage werewolf and null Arca can do either.
Make sure to be consuming corpses (15 ult per tick) and light attack weaving! Being in werewold form costs ~50 ult every ~10 secs. The transformation also has to be on the bar with the 2 5-piece set bonuses, usually the front bar otherwise you'll be using your arena weapon on WW which is a teensy bit (completely) useless.
Gnash Setup
Prebuff roar, rage and ult, apply carnage and claw dots and then gnash to your hearts content. Make sure to keep your dots up while gnashing.
Hircines rage needs to be reapplied every 20 seconds for fury generation (which is the blue bar beneath magicka for your ult).
Ferocious roar has a lot of group utility, giving everyone within ~10 meters major courage so overcasting despite the synergy still having 10 seconds left is recommended. This is our only source of major courage so big importanté.
Zenkosh
Zen dots are hemorrhage, burning, poisoned, bleed dot from carnage or bloodclaw, physical dmg dot from alkosh. You will probably have others like sundered but the top ones are the most reliable.
I would recommend using the cooldown tracker add-on to track the feeding frenzy passive and alkosh. Use feeding frenzy when next to the boss/adds so alkosh procs on them. Other synergies™ should be available.
Fury Setup
Using brutal carnage/pounce and claw fury.
Prebuff roar, rage and ult. The same rules apply to these as they do in the gnash setup.
Build up your carnage stacks up to 3 and only use when the cooldown is low. Never let your carnage stacks fall off as you will have to build up the stacks again.
Use fury claws whenever you don't have to refresh a dot/skill which should be most of the time.
At 25% execute, you'll want to switch to using gnash as that will give you much higher damage. Gnash can also be used if a dot is almost about to run out but there's not enough time to use claw fury.
Sets
The Shattered Paths Signet is a must for werewolves as you now have a different resource (fury) for ults than ult meaning you can be above 170 ult all of the time.
For a Zenkosh werewolf, use Zens daggers, a sash and jewellery with Alkosh on the body.
A full parse WW would use Savage Werewolf on the weapons and jewellery with Null Arca on the body. Switch to Sul Xan for add pulls.
I've also included a basic nightblade DD build in case of the transformation dropping but I have never done a nightblade DD so good luck with that.