I’ve been watching lots of videos about how to set up a book in InDesign. The best are from Lynda.com (there are a lot of them on YouTube). I’ve picked 6 x 9 inch size for the paperback, as it is used by Createspace for books of this kind.
The biggest pain so far is getting the text to wrap properly around the pictures. I’ll worry about that more after the editing is finished. I’m using FirstEditing.com for my copy-editing and my friends for general review. Let me know if you want to join in the crowd-edit and I’ll send you the pdfs!