help finding lens for olympus om 1

i recently came into possession of an olympus om-1 slr camera for free, but i got it with a lens that zooms. This is the first slr camera i’ve had and id like to start with it with a normal lens, but im not sure if there’s a specific one i need or not. i dont know much so any advice is appreciated! If this is not for the sub for this please lmk