Many people expect to become a tai chi teacher overnight.
This is an unfortunate by-product of questionable tai chi schools who make false promises and hand out teaching certificates to people who possess no skill whatsoever.
You can only teach tai chi once you have gained an advanced-level understanding of the art and know how to articulate it to a class of people such that they can learn something too.
Trainee teachers know the art. They are long-term students with considerable experience in tai chi.
If you do not know it yourself, what can you possibly teach?
Expect to be studying for a decade before you are taught how to teach somebody else.