I’m not sure how this works, but if you like you could contact Guy Andrews with Exercise ETC. and ask him how he did it for his courses:
I know they provide CEUs for many different organizations, so he might be a good person to ask.
I hope this helps. Good luck!
If you have created a course you can get it approved through different organizations such as ACE and NASM. Then you would have to market those courses through different outlets. You just have to contact those organizations submit your work, pay a fee and wait for approval.