Warwick is a good jungler, easily jungling and farming. At LVL 6, he becomes insane as he's ultimate is unlocked and he can start killing people. Start with the ultimate, then hungering strike,hunter's call, and using his blood scent to chase people down.
For Masteries, take 21/0/9. The 9 masteries in utilities are movement speed and runic affinity.The 21 is the standard 21 for most of the other builds. However, i swap the havoc with the lifesteal as warwick needs all the lifesteal he can get if u use this build.