I see lots of newbies complaining that the documentation for many of the cadcam softwares is being classed as "weak". In fact, I've heard this so often that I'm beginning to not believe it.
If you jump into the middle of any new field unprepared (by previous experience), it is going to take a while to get familiar with the tech speak in that field. The processes involved from CAD to finished part includes tens of thousands of "tips" that is going to take a while to acquire.
I highly doubt that any crash course will prepare you adequately, as it simply takes time (and sleep) for your brain to absorb and categorize the new info.
Its better to get started, go as far as you can (reading the available help, etc), even if its only one step
Then, look for forum help somewhere for whatever it is.
Don't be overwhelmed by the flood of new info, thinking you can take it all in at one go by simply hearing the words from a teacher. You're not ready to learn until you are really in the thick of something, that's when you are really ready to learn it.
The repetition of doing your first part over and over may seem frustrating, but its how you get proficient with the rudiments of using your CAD, the CAM and your machine.
Don't cheat yourself by milling that square pocket on your manual mill. Make yourself do it completely in cadcam. If you don't practice on the simple stuff that you completely understand, you'll get nowhere when the going gets tougher.