There are so may good teachers
I'm not so sure...
If you have no interest in teaching, I wouldn't bother. And you can always teach informally/help out/be of guidance eg. without the teacher label, settings, activities etc.
Daniel about the Visuddhimagga:
I firmly believe that all teachers who wish to teach in the Theravada tradition should: a) be at least Second Path, and b) have read this book at least once.