One of the things I’m also looking to work on is airbrushing and there is a single course hidden under the clay sculpting section. Although the info on how an airbrush works doesn’t really apply, there are some practice exercises that could be a place you could start with adapted to Photoshop on doing lines and dots and circles. Even traditional artists will often do these types of things as warm ups. Being new to using a tablet these types of exercises can help with developing a sense of feel for the pressure sensitivity.
Also, don’t be afraid to practice tracing by loading up an image you like with low opacity and then tracing over it on another layer. You can even use Blender to pose a model, position it front of the camera and do quick render to use as a base reference to trace over. Then as you get better at tracing, move your reference to another screen and practice drawing it.
