After you have followed the starting setup you should be able to expand from there. Play a lot with Gimp and Inkscape, You can’t burn anything that does not get to the Glowforge, so a dozen files just trying stuff out can teach you a lot before you go to cutting anything, 
For each new material, I make one of these and keep it as a reference, and from it, the right settings can emerge without using the Proofgrade settings