Define My Digital Project Scope

I’m sitting on a promising idea but the details are still fuzzy. I need a strategist who can help me turn this rough concept into a crystal-clear project brief that’s ready for designers and developers to run with... (Budget: $15 - $25 USD, Jobs: Agile Project Management, Business Analysis, Graphic Design, Mobile App Development, Photoshop, Project Management, User Experience Research, User Interface / IA)