Polyfibron.com (one of the major suppliers of Photopolymer plates) has
a couple of very useful tech sheets listed on their website.
Quickest way to find these is to go to their Site Index. These is one
tech sheet on printing with photopolymer plates and another on
processing photopolymer plates.
Since polyfibron produces photopolymer in many different
configurations not all of these are suitable for photopolymer. And in
some cases, when they are talking about "back-exposure" for instance,
they are discussing an older technology.