LolClassic- tips vs Olaf

I played league and mained teemo ftom beta until zed release release then I quit the game. I returned to classic and having a good time. My issue is any specific items or runes should I pick against olaf ? And how should I play against him. I lose all the trades, he runs me down pretty hard. Only time i dont feel as a lane bully is against Olaf and he is quiet popular.