Good build for WW jungling is:
Start whit Boots + 3 health potions.
Upgrade Phage to Frozen Mallet or if you can afford and are fed, Trinity Force
Upgrade Mardred Razors to Mardred Bloodrazors.
As a last item, you can choose Bloodtrister for more sustain/damage, Guardian Angel just because it's troll, Frozen Hearth is good too, or almost any end game defensive item for more tanking or ofensive item whit some sustain/defense to fit the role better.