by a.j. hoge [...] It is very easy to get a job teaching English in Bangkok and this is the path that most people take. However, full time teaching has a number of drawbacks.... The typical English teacher is paid between 200 and 300 Baht an hour.... What starts as a grand adventure may soon become a grueling drag.
However, there is another way - freelancing. Freelance teachers teach private lessons on their own, typically in their own home or in the home of a student. These opportunities pay more than jobs, are more relaxed, and are usually more fun to teach.
While traditional full-time work is easier to get, a freelance business can be more rewarding. Unfortunately, there are no recruiters or one-step solutions to becoming a private teacher.... However, by observing the following steps, it is possible, within five months or less, to establish a solid income exclusively from private lessons. [...]

http://www.transitionsabroad.com/publications/magazine/0411/freelance_teaching_english_in_bangkok_thailand.shtml