Welcome

and congratulations on the new bike
Personally I found that the transition from tar to gravel was a bit tricky.
Not at first though. You just tend to go for it without thinking of any skills you are supposed to have.
After the first couple of falls and the accompanying expense of replacing all the broken parts, you start to get a bit worried about your abilities.
Doing a BMW course should give you some much needed confidence so you can have fun right from the start.
If you decide to teach yourself and take tips from riders already used to dirt you will also get to that level of proficiency but it normally takes a bit longer.
The GSA is a great bike but you took on a hell of a huge beast to start off your dusty life. It's nothing like your XR200. believe me...
Have fun... You'll love it! It's awesome