I have a large social network, and I sell micro ads, but I want to get some sales structure in place & go after corporations. What should I do?

I have over 10 million on Instagram & Facebook and a large network of partners who I could sell on behalf of. I've created numediaagency.com to showcase my network. I see people like whistle sports selling ads to multibillion dollar companies, and I'm ready to get structure in place and grow up to start getting these large campaigns. I need help with the sales processes, structure, tips etc. to get started. Who should I consult? How should I get started?