Page numbering belongs to the notorious unintuitive way that Word handles header, footer and sections. Here is how you will be able to have your numbers align to the exterior corners, at the right for odd pages, at the left for even pages.

First define the Page Layout of your document as “different for odd and even pages,” and as “different first page.”

Then open the footer of an odd page, not the first page of that section, insert page numbering (alt+shift+p) and align it to the right.

Open the footer of an even page, again, not the first page of that section, insert page numbering and align the number to the left. Enjoy!

Being yourself an author or student you will perhaps appreciate especially this feature, that the very structure of the book will teach you how to work. The book contains even chapters on how to prepare a document for professional publishers such as Amazon. Reading Steven Adams' Writing a book or thesis in Microsoft Word you are surprised realizing it makes you want to work -- to think, write, use Word and be creative!