Believe it or not, you might already have most of an ebook written already. If you are already making money with a blog, those blog posts could be turned into an ebook with some editing. Simply collect relevant blog posts into an order that makes sense, make any needed edits so that references that aren’t relevant are taken out, and add an introduction and conclusion, and you’re done. Any blog posts you use should cover the same or related topics and work well together.