There’s a ton of stuff you can do from here depending on what you require for your book.
The page setup for creating a book or booklet is now complete. Once you’ve adjusted the settings, click “OK.” This is for content that reads from right to left, such as Japanese-style books. Tip: You may notice a “Reverse Book Fold” option. Once selected, you’ll notice your page orientation automatically changes from “Portrait” to “Landscape.” Next, select the arrow next to “Multiple Pages” in the “Pages” group, then select “Book Fold” from the drop-down menu. That said, go ahead and give the gutter a 1” margin, so the content of your book doesn’t get lost in the fold.
This could cause issues further on, as the gutter margin is the amount of space between the content of your book and the fold where the pages of the book will be bound together. By default, the “Gutter” margin will be set to 0. In the “Margins” group, you’re able to set the margins of the page. This opens the “Page Setup” window, where you will automatically be on the “Margin” tab. In the “Page Setup” group, click the small arrow at the bottom-right. Once you’re in Word, head over to the “Layout” tab. It’s recommended that you adjust these setting before writing the content of your book to prevent formatting issues late on.