I am a little confused, are you want to sponsor a signature campaign or do you want to be a signature campaign participant? Because you made two questions, one about managing campaigns another is how campaign posts work. As a campaign manager, I take the works from the companies by communicating with them. We fixed pay rates and manager's fees as well. After we agree with both parties about campaign terms and conditions then start run a campaign. Sometimes companies ask where to make a post or where not to post, so managers have to follow the company's requirements, of course, I write all the rules in the campaign thread which is open for all the participants. Eventually, I select desired participants who applied to get in. I monitor them during the campaign and count the post accordingly, payment held based on post count. I escrowed campaign funds with me although all managers do not manage campaigns the same way. We would manage campaigns without escrow funds only for high reputed companies. That's how I manage the signature campaign. Hope you got both of your answers.