Hi:
Good thoughts here but I'm wondering if you've taken the step of validating your idea with a good number of teachers via actual conversations (assuming they're your buyer).
Is the problem you're seeking to address an actual pain point they're seeking to resolve? How do they currently resolve it? What will you need to overcome to get them to replace their current approach with your solution?
Separately, a relationship with a dev shop or freelancer can be (and should be) well-defined with objectives, milestones, etc. A partnership should similarly be thoroughly vetted and detailed before any agreement is signed to help avoid the likelihood of pain and anguish down the road.
If you wish to discuss, send me a PM through Clarity for 15 free minutes.
Cheers,
Kerby