MERN Developer Manual & Tutorial

My MERN application is running smoothly, but every new contributor still spends too long figuring out how to get started. I need a clear, developer-focused user manual that lays out, step-by-step, how to work with the existing MongoDB, Express, React and Node codebase... (Budget: $30 - $250 USD, Jobs: Docker, Express JS, Flutter, Frontend Development, JavaScript, MERN, MongoDB, Node.js, NoSQL Couch & Mongo, Web Development)