Landscape orientation: Intro to word-processing and page layout documents.
Templates come with placeholder text and images that you replace with your own content. Placeholders give you an idea of what a book created with this template might look like when you use its text and object styles. You can modify the template however you like and add features like an interactive Create and format a document.
If you created a book using iBooks Author, you can open the iBooks Author file in Pages and save it as a Pages document. See Intro to images, charts, and other objects in Pages on MacAdd or delete a chart in Pages on Mac