Full Stack Development in the context of MERN refers to the development of both the front-end and back-end portions of an application using the MERN stack, which is a set of JavaScript technologies. The MERN stack comprises MongoDB, Express.js, React.js, and Node.js.

Components of MERN Stack:

1. MongoDB: A NoSQL database to store data.
2. Express.js: A back-end web application framework running on top of Node.js.
3. React.js: A front-end library for building user interfaces.
4. Node.js: The runtime environment to run JavaScript server-side code.

Benefits of MERN Stack:

1. JavaScript Everywhere: Utilizes JavaScript for both server-side and client-side scripts.
2. Efficient Data Flow: MongoDB provides a more flexible data structure, and React helps with efficient data rendering.
3. Community Support: Being popular technologies, they have strong community support and lots of tutorials and troubleshooting guides.
4. Scalability: Highly scalable due to asynchronous operations and a non-blocking architecture.

Typical Workflow:

1. User Interaction: The user interacts with the React-based front-end interface.
2. HTTP Request: A HTTP request is made to the Express.js server, usually hosted on Node.js.
3. Server-side Logic: Express.js handles the request, performs CRUD operations with MongoDB if needed.
4. Response: Express.js then returns the response, often to be rendered by React on the front-end.

Full Stack MERN Roles:

1. Front-end Developer: Focuses on the user interface and user experience, primarily working with React.
2. Back-end Developer: Works on server logic, database interactions, and performance optimization, mainly using Node.js, and Express.js.
3. Database Administrator: Manages the MongoDB database.
4. Full-Stack Developer: Capable of handling both the front-end and back-end development.

Learning Path:

1. Learn the basics of HTML, CSS, and JavaScript
2. Deep dive into Node.js and understand asynchronous programming
3. Learn Express.js for server-side development
4. Get comfortable with MongoDB and databases
5. Finally, specialize in React.js for front-end development