Pipergirl is correct.
To instruct you need 150hrs PIC, CPL theory (not ATPL), class 2 medical and FI course.
To instruct and and to "legally" get paid you need the above plus the CPL flight test and a class 1 medical.
Regarding the CPL theory exams theres a lot that is useful but I'm not sure why you need to know the date that ICAO was formed, you don't need to know when the AA was formed to drive!!!!!!