I dont explain much in detail, everyone basicaly has his own way of playing each hero.This build is not made for jungle but you can go using Ignite instead of smite. Even if you dont go jungle you can still buy potions in the early game.

I use Ignite and Flash which i belive are the best. You can use heal until you learn how to play with olaf. Also if you want to jungle you can use smite instead of ignite.