Try looking for this as for Cinema 4D, Cinerender is a lite version of the Cinema 4D render engine, so if you learn how they work in Cinema 4D you can understand how it works in ARCHICAD. I use Cinema 4D before Cinerender is in ARCHICAD, so when Cinerender came to ARCHICAD I felt at home.
I can't point you right now to a specific tutorial or something, but there is a lot of information online about shaders in Cinema 4D, a lot more than what is for Cienrender in ARCHICAD.
Hope that helps!