Documentation always comes along at or after release, along with tutorials too - this is because there can be changes to the UI and functionality while things are in development, so trying to document too early would lead to much "chasing of your own tail" and continually having to adjust it :)
Meantime, if you share a screen grab of your material set up (or your scene), plus what you are seeing in a render, folks can help you with what is wrong with the set up and get you up and running!
