I am big on testing your ideas and resolve before diving in head first. Might be a great idea but you might find you hate doing it.

That does sound like a good idea.  There are plenty of brick & mortar shops for coding and robotics classes that would be well set up for something like this.

SimpleStacker

Maybe you can find an existing space that is suitable and used for something else that you could partner with to host your classes once per week to test the viability of your idea before diving in.