Writing an Open Book in the form of an eBook (e.g., ePub3 format, PDF) requires subject matter expertise, dedication, and investments in precious time and effort. For a first-time textbook writer, it will also require an investment in learning how to best accomplish the task.
WikiHow has an excellent article on How to Write a Textbook.
Wikibooks also published this infographic with 5 Rules of Textbook Development:
5 Rules of Textbook Development by Wikibooks: Textbook Considerations various authors (Transcript for 5 Rules of Textbook Development).
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