
This forum is UK-based, but I would think the same criteria apply on your side of the Herring Pond; you will need to show him and then bitch owners who think he's the right potential stud for their bitches will contact you.
He will also need to have been tested (with satisfactory results) for any hereditary health conditions that affect schnauzers. I understand they can suffer from hereditary eye conditions (cataracts and GPRA) so will need annual tests for these.