As this is my first guide I'll keep this guide short and simple for you readers.

Pros: Can initiate teamfights easily
Tears enemies apart mid-late game
Strong ganks
Cons: Mana-hungry early game
Don't miss the bandage toss or you're doomed
Nothing else >=)

Start Wolves, go blue, wraiths, then wolves again. Because you start boots 3x health pots you may have to recall early on, but it'll be worth it trust me. Start ganking at lvl 4. Simple as that. If you've jungled before this is self-explanatory

Amumu does more damage than you can imagine with his passive. His ult is a game changer and he can dive turrets effectively. I've tried to follow the top Amumu builds that tell you to build items like Frozen Heart Shurelya's etc... but those items don't let you play to Amumu's potential. I ask that you give this a try and you'll see just how strong he can be