Part Four of my series of FAQ for people in various typical positions. Part Three (with links to Parts One and Two) is here, and the (proper) TEFL.net FAQ pages are here.

I’ve been teaching immigrants English in my own country. Is it still worth doing a TEFL course before I try to teach abroad?

Yes. The two types of teaching are surprisingly different, and employers will expect it.

I want to move into Business English/ Young Learners. Is it better to do a general TEFL certificate or a more specific qualification?

It is almost always better to do a TEFL certificate such as the Cambridge CELTA first, and in fact some more specific qualifications such as the Cambridge Young Learner Extension to the CELTA are designed for people who have already finished such courses.

In my situation, is it better to do a TEFL certificate, a TEFL diploma or an MA in TEFL?

You will need at least two years of experience to get on (respectable) diploma or MA courses, and at least three years is probably more advisable. Most (post-experience) MAs in TEFL have no observed teaching practice, so although they could help your career they will only really help your teaching if you also have plenty of teacher development such as observations in your own school. Most people who enter diploma and MA courses also have an initial qualification, so a TEFL certificate might be more suitable unless you have read a lot and taken part in plenty of other kinds of teacher development.