Debbie B. answered 06/07/19
Proofreading and Editing Specialist with 20+ years of experience
Typically you'll go for whatever the default margin is that Word provides for your **trim size** which means do you want the book to actually print as 8 1/2 x 11 or 6x9 or 5x8? So the size of your book has some inherent defaults. I have been feverishly formatting manuscripts for over a year, so if you need some more help, please let me know!