Olaf is an under appreciated champion but he has a lot of room to shine. He has attack speed, life steal, a slow, and true damage. Tanky Olaf low health is a force to be reckoned with...he's also the only Champ I have soloed the dragon at level 3.

I like to start W for the sustain and doesn't hurt mana too much. And flash instead of ghost is because it's a better engage move, on top of you can slow someone on the other side of the wall then he can fall through. I like to start gromp then go blue buff. Then you move to murk wolf to life steal them go to red buff. After that we go ancient Krug or crimson raptors. Repeat process till you feel ready to gank