Commercial Instructors rating?

[Bear Cub]

I read a posting recently about how to become an instructor for the instrument rating.

Someone replied that the minimums were to hold the rating, attend a five hour course and do a flight test.

Is it similar for becoming a Commercial Flight Instructor?

What would a CPL (only) holder have to do to be allowed to teach CPL stuff?

Any difference for a CPL/IR holder?

Any difference for an ATPL holder?

Any difference for either a CPL or ATPL who already has a BCPL instructor rating?

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