How do I find a developer?

[Tab Teehee]

I'm wanting to develop approximately 30 acres of residential zoned land I own in Oklahoma. In the center of this acreage is a 20 unit apartment complex, that I own as well. I've got my own visions of what I'd like to build and I'm trying to reach out to area realtors to get feedback. I've never done more than rentals, rehabs and flips, never broke ground on anything like this! Before I invest too much time and money in this venture myself, I know i'm going to need a partner/s. How should I handle that? Go to builders, ask realtors? Thoughts?