I would look in the manual...good info. I don't know of a simple tutorial on that off hand. Shaders are complex...covers alot. I can tell you that each shader has channels very similiar to other programs, but slightly diff names. You can mix and match just about anything concievable in those channels.It uses a tree hierarchy. Displacement is on another tab. Formulas are entered as math equations and I don't think you want to go there yet, not as well documented or used, I am afraid, there is some info in manual. Channels: color alpha highlight shininess bump reflection transparency refraction glow subsurface translucency

No need to think outside the box....
    Just make it invisible.