If the main idea is to have the contents laid out for a book binding, then you are approaching the problem from a wrong direction. What you want to do is set up a gutter in your page setup dialog box. There are many options as to how to set this gutter: left side, right side, mirror margins, bookfold etc. You will find the page set up link in the Print preview of the document. The shortcut for this view is Ctrl+P.

You should be able to find enough help on this from the MS Word help feature (F1).