Ask HN: Next steps once business concept is verified?

I could really use some pointers on what my next step should be. A B2B service idea dawned on me from my experience as a consultant. I vetted the idea with ~10 professionals in the field. All of them really like the idea and had a lot of questions and interest. I am not a developer. Do I hire the development out or should I work on finding a co-founder? Honestly, I prefer a partner, but have reservations about approaching someone with an idea, vision, and options/share.