I don't know about other countries, but in Canada, you need a one or two year program to become a teacher, at least for public schools. Were you able to "drift" into this because your country has fewer regulations, or is it that private schools are less restrictive?
In America, private schools are almost unregulated. They get "accredited" by a group that evaluates indeoendent schools. So basically anyone w college degree or beyond with no serious criminal history can teach.
No real advice: it wasn't intentional; something that I just drifted to. It's really fulfilling but not lucrative.