If you're thinking about Korea, I can tell you a lot. I was one thing away from doing it after college.
I can tell you all the process. In a nutshell, you can go two ways:
a. teach for the public education system:
Pros: Job security, professionalism, free housing, quality of environment
Cons: Money is ok at best, long hours, demanding
b. teach for the private tutoring service / be a private tutor:
Pros: Potentially insane $$. Filthy rich Korean families will pay $50+ an hour for a prestigous (only need BS degree) tutor with blond hair and blue eyes as they perceive this 'stereotypical' look as the most authentic candidate as a tutor. Easy hours. 10-15 hours a day of this will get you more $$ than you want.
Cons: No security, such jobs are hard to find, you gotta freelance, these tend to be very seasonal (summer vacation)
General requirements are:
MUST BE a US Citizen (This is why I couldn't do it. I'm a tenth-year Korean-American.
Helps A LOT if you're caucasian, as they perceive it is more 'authentic' of an english teacher.
MUST HOLD a bachelor's. Any four-year school would do.
PM me for details.
PM me for details.