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I've done some ESL teaching. I did one on one tutoring with Brazilian woman who pretty much spoke only Brazilian Portuguese. I can tell you from my experience that it takes a lot of patience. As far as teaching ESL, you may be referring to actually traveling to South Korea to teach, which a lot of people do. I've generally heard that people have good experiences doing it, and that you don't make a lot of money, your living expenses are not high so you come back with some savings.
You can do a simple google search of TEFL programs (teaching English as a foreign language) and check out their websites (such as this one: http://www.teflcertificate.com/explore.html). I am sure they would be happy to talk to you more about it or send you some more information.