As an author, writing a book is the first challenge. As an indie author, however, formatting and designing it is your second. You want to put your best foot forward in this process. You don't want your readers to be able to tell the difference between your self-published book and a traditionally published book. If you have money, you can get someone to design your cover and design and format your interior. However, if you can't afford that, you must do it yourself. But, can you make your interior look as professional as the exterior? That's assuming you invested in a cover designer because if you haven't, it will be obvious. If you have to spend money creating your book, spend it on editing and a cover. The self-published book covers done in Microsoft Word are obvious. I know you think what you made looks great. But trust me, we can tell you did it yourself. Unless you specialize in design, don't attempt to design your own cover.
But today, I don't want to talk about book covers. I want to talk about the inside of your book and the pages you should include before you get to your actual book.