Hello Leilani,
I have been using the PPR for the past two years and I would be happy to help you.
It took me a lot of time and effort to understand it and required much trial and error, but today it is the corner stone of my executive reporting.
I suggest to start by reading the following documentation:
https://success.clarizen.com/hc/en-us/articles/205711718-16-5-Document-Publisher
Good Luck,
Arnon