Your first step, in my opinion, is to take a deep breath and step back. Then come up with two projects that you want to make on the Glowforge that are simple. Think about a name cutout or something like that, something very simple. Then write down those projects. This gives you a place to start. Then determine how to want to make those projects. Once you have the projects written down you have a lot more detail to communicate in your request for help.
It sounds like you may benefit from the Premium subscription for a month or two. This will put designs right in the Glowforge control interface, or dashboard, and allow you to get an idea of where you would like to take your experience with the Glowforge. The Premium tools are very powerful and also allow you to do very basic projects on your own. Once you have a feel of how the unit works, you can then look into finding a program that you want to learn to use.
Right now though you are probably going to be best suited with books, videos, etc. unless you can find someone who knows the software you want to use and is willing to give online classes.