Welcome aboard @Reeveseye ! I have to say, it is definitely worth the wait.
Currently, it does not accept .stl files.
For sculpting, you have two options.
The first is using depth maps. Here is some good resources for it.
The second option is slicing a 3d model into segments (similar to the Globe project in there video). This will require learning a 3d modeling program.
I would also check out Glowforge Tips and Tricks. The community here made a bunch of tutorials which should be a big help. Here is the table of contents.
Lastly, you should add yourself to the map. You can check around to see if there are any Glowfolk near you that have there Glowforges, they might be nice enough to let you come by and check it out!
