Olaf main

Hello i am new to league, and i really wanna be good at playing Olaf, i have this build i wanna hear your opinion on, is it any good or should i add something else on.

Ravenous Hydra

Bloodthirster

Infinity Edge

Blade of the Ruined King

Fiendhunter Bolts

Sterak's Gage

Let me know if i should take an item out and replace it with something else