When doing a design/layout for a newsletter or book, it will help us if you provide your files already paginated.
In fact, if you have any copy, photos or background screens that run between two pages it is required.
See below for an example of a paginated 12 page book.
11 x 17, folded, collated and stapled to make an 8 1/2 x 11 book:
Page 1, or the cover, is always on the right side, with the last page, or back cover, on the left.
It is helpful to make a paper dummy, folding and numbering the sheets of your book.
Then you can open the pages up flat, and easily see how the pages should paginate. Remember: each sheet of paper, when paginatated equals four complete pages.
(Page 3 and page 10 shown in detail