There are tons of resources here on the forum! Your first stop should be the Glowforge Tips and Tricks category, where there are many tutorials written by the community for exactly what you want to do. I won’t point you to a specific one because it depends on what software you are using. But look for tutorials in the Designing for 2D Vector Software section, and maybe the AutoTrace tutorials or “designing cutlines from graphics” tutorials.
By the way, this type of question might be better posted in Beyond the Manual where the community helps answer these types of questions. Problems and Support is more for creating trouble tickets for the attention of Glowforge staff. I’ll move it for you.