Start at jungle. When u have ring of health, boots and ultimate gank lane where ur jungle is. When u finish arcane u can use more times ur battle hunger to catch ur enemies better. Blink dagger is very important for axe: blink to target and use berserker's call and u can easly kill him. When u get agahnmis, in team fights u will finish ur enemies very quickly because ur ult's cooldown will be reduced to 6 seconds. After u have done all this items, work on tarrasque.
Creeping / Jungling
At lvl 1 until 5 u can't to minotaurs and the the hardest creeps.
Ur job is to use blink dagger and tank as much as u can with ur first skill, then ur team will be able to easly kill them. When u have aghanmis u can finish all enemies because ur ult's cooldown will be reduced to 6 seconds.