Ahh, I see! Personally, I would put the Wiccan Rede after the “Index” page but before the first category- it’s a very powerful piece that those who choose to follow it use to guide their entire practice. However, you could also make a case for putting it in the “Wiccan Wisdom” category.
There really are no “right” or “wrong” answers when building your personal Book- what works for one person may not work or make sense for the next. At the end of the day, the most important thing is that your Book works for you! 
When designing your first BoS, you might consider using a three-ring binder- that way it is easy to quickly move and rearrange things. @Berta shared a picture of her beautiful BoS in a binder here:
Once you’ve figured out an order and system that works for you, you could seal the binding and make it permanent. Just an idea!
Wishing you all the best, Laurel- blessed be! 