eBooks are no different from any other type of book except in their medium of publication, so the most important first step to writing one is to decide on, and develop, an idea for one. The basic way to do this is to sit down and write a brief phrase or sentence that encapsulates the information you'd like to put in your book. Once you have that, you can build on it to create a finished product.  Writers who plan to create a book of fiction will have to spend considerably more time coming up with ideas and plot points. Read this article on how to write a novel for more relevant advice. The eBook format has the advantage of being not only open to self-publishers, but essentially free for them, which means that “books” too short to really be worth printing on paper can make perfectly valid eBooks. Therefore, feel free to use a simple idea. Start with the basic idea you wrote down, and think about different aspects of it. It may be helpful for you to draw a web of concepts to do this. For example, let's say you wanted to write a book about how to sell real estate for beginners. You could write down things like “licenses and fees,” “selling techniques,” and “cost vs. expected returns.” Connect specifics that are related to each of them, and so on, until you have enough detail to see the structure of the words in your head. Different books call for different approaches. Memoirs and self-help books might do better with a vertical outline; a book of fixes for common household problems will probably come together faster using a web of ideas. After unpacking and expanding your core idea, you should have a lot of information about your basic topic written down. Rearrange and organize it in a vertical outline until it makes sense to you and matches the way you'd like your book to flow. Think in terms of what your audience will need to know first, and put basics at the beginning. Once those have been covered, more advanced concepts can follow without losing the reader. Each step along your line will end up being a...

TL;DR in Vietnamese:
Tìm ý tưởng. Mở rộng ý tưởng. Sắp xếp nội dung. Viết sách. Xem lại và viết lại. Thêm chi tiết. Thêm trang bìa. Chia sẻ ebook cho bạn bè. Ghi lại phản hồi và cải thiện ebook trước khi xuất bản.