I'm ready to give that first class on "how to become ruler of a powerful realm and then destroy it within 15 months."
Teaching from experience.
There are one Adventurer class I can give. A combination of below.
1) How to become a good annoying Adventurer, the first Adventurer to be discussed by your own realm council
2) How to end up in your own realm prison as Adventurer, beaten up by your own realm nobles to almost dead and broken bones in your body