What all do I need to get married there.

I don't think that is a possible area to do so but you can contact City of Columbus parks and rec wedding department.

For a small wedding just get a minister and show up. When I say small I mean 5 counting minister

Call parks department. It's a simple process

Start by contacting the parks department, they can give you that answer!

I would imagine just a permit from the city. But I'm note sure. Maybe try contacting the parks department.