This is a great question and an important technique that has many uses and has been discussed and 'cussed many times over the years. There are different approaches. Often it is called “print and cut”, meaning print out a design on an image printer and then cut out the shapes with the Glowforge.
Here is one archival attempt at it:
Here is a long topic that discusses it in detail:
And here is a Glowforge stalwart giving a how to on it: