Develop a comprehensive, step-by-step guide for creating a book writing application. The guide should include the following sections: 

1. Conceptualization: Define the purpose and target audience of the app.
2. Market Research: Analyze existing book writing apps and identify gaps in the market.
3. Feature Set: List essential and optional features, such as text editing tools, organization methods (e.g., chapters, notes), collaboration capabilities, and export options.
4. Design: Outline key design principles, including user interface (UI) and user experience (UX) considerations.
5. Technology Stack: Recommend programming languages, frameworks, and platforms suitable for app development.
6. Development Process: Describe methodologies (e.g., Agile, Waterfall) for managing the app development lifecycle.
7. Testing: Suggest strategies for quality assurance, including user testing and bug tracking.
8. Launch: Provide a plan for launching the app, including marketing strategies and user engagement methods.
9. Maintenance and Updates: Discuss how to maintain the app post-launch and incorporate user feedback for future improvements. 

Ensure that each section is detailed, actionable, and accessible for both novice and experienced developers.