I don’t use Photoshop (I use GIMP occasionally, because it’s free), so I can’t help much. BUT…
Also, I would suggest checking out the rest of the Glowforge Tips and Tricks category. There is a handy table of contents.
Lastly, I would recommend spending some time with Inkscape or another vector program. Inkscape is free. I find it very useful for putting cut-lines around images.
Good luck! Come back and ask questions if you have any issues once you get your GF.