How to find the right marketing cofounder

I’m a high school student preparing to launch an AI-powered study app that’s nearly finished on the coding side. As I get ready for launch, I’m searching for a collaborator to take charge of organic social media marketing. I’m looking for someone who knows how to build and engage an audience effectively and is comfortable creating video content. I plan to offer the cofounder 40% of the profit. Do you have any tips on where to find the right person and how to identify if they’re the best fit?