There are only 3 main classes in OD&D without using any supplements: fighting-man, magic-user, and cleric. The first 3 stats are the prime requisites for the 3 classes, and with only wisdom in double digits it seems this fellow would be a better cleric. But note that 9-12 are all considered average scores, with no bonuses or penalties to experience gained and no bonuses or penalties to abilities. This character does receive a +1 for missile fire for having an above average Dex, so being a fighting-man with a bow is an option. (The thief class won't appear until Supplement I: Greyhawk in 1975.)

I still want to let the dice decide the class, so he's a cleric with the title "Acolyte" at level 1, and I'm going to argue that slings are non-edged and therefore allowed so he can use that missile bonus. Only humans can be clerics in these rules, so that's what he is. There's no suggestion that picking a god or pantheon is necessary, and a cleric doesn't commit between Law or Chaos until reaching level 7. He needs a name -- "Brother Eggmus" will do, working in EGG's initials.

A Con of 8 isn't low enough to penalize his hit points. I roll 1d6 and get 3 hp. (Per 1974 rules all classes are assumed to roll d6s for hp. As characters level up, fighting-men gain dice and bonuses faster than clerics, who gain more than magic-users. In 1975 Greyhawk specified different hit dice types for different classes.)

A roll of 3d6 x10 yields 60 gold pieces to start, barely enough to purchase chainmail, a shield, a mace, and a pack, food, water skins, and torches. Sling is missing from the price list, but a note at the bottom says to interpret other prices from the examples given.