red into raptors into blue jungle. You can gank a lot in the early game. Keep heating lvl around 50 when ganking and clearing. Save your smite for scuttle crabs. Rumble is a fast clearer, he can do dragon really fast. Try to take a lot of dark harvest stacks. Don't be scared of using equalizer, it has a really short cooldown. If you miss it's ok. You can always become better at hitting equalizers, it's a really creative spell. You can never be bored of rumble cuz the champ is so fun to play in jungle. He might seem off-meta after the nerf but he's still good and enemies can't predict him.