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*due to unspecified 'bad language' the website thinks I've put in here I'll have to post it section-by-section to see were it is...*
You have to balance a lot of things.
In many parts of Asia and S. America you don't need a TEFL qual to get a job, but if you have one, any one, then you can do the job better, get paid more, and it opens the door to a few more jobs.
The better qualification - like CELTA - the greater the effect, but almost anything will have some effect.
For Europe, unless you have an EU passport, you are unlikely to find much work at all.