Hi Sardo and welcome
I have similar plans, followed the path of doing several years sailing, racing around cans etc on many different boats, inshore/offshore.
One big thing I have learnt which I wasn't expecting was how not to sail, how not to set a boat up, Im not picking faults with skippers and boats, more about what suits me.
As for doing a "course". I have looked into a few, asides from the cost and time it takes Im not one to learn from a classroom, hands on for me.
A mate did some flash course a few months ago. I asked what was the biggest thing he learnt from the course to which he replied
"stay with the boat"
So there you have it, go sailing and stay with your boat (unless its on the bottom of the ocean.)
Please send me 11k (50% discount for mates rates)

cheers