Need Help With Page Size

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I have Office 365 installed on my MacBook Pro Sierra OS. I am writing a novel (self publishing) and the printing company requires that the manuscript be put into a pdf format and that the page size match the actual page size of the finished book. I want the page size to be 5.5 x 8.5.

When I use the drop down on the page size icon and click on the 5.5 x 8.5, only the first page shrinks to that size and all of the following pages remain the same size that they were. How do I get all of the pages to be the same size, i.e., 5.5 x 8.5?


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