Moving from Serif PagePlus to LibreOffice

I am moving from Serif PagePlus to LibreOffice and am experiencing difficulty in setting up a 72 page A5 newsletter.
A previous pdf version created in Serif imports cleanly into Libreoffice through draw, but is this the best way of setting it out? I would like to be able to insert 72 empty pages and view them two at a time, like a book. The response on here for an 8 page newsletter focused more on the on the print side.

A few tips would be gratefully appreciated.