For japan there is a nice site that has good job posting. I found my first position using it. I sent out 4 applications and got 4 job offers. It helped a bit that I was already in Japan and held a visa. anyway here is the site:
www.findateacher.net/ The site has changed from when I used it six years ago, but at a glance it still seems like they provide good service.
There is also a possibility of coming over to Japan on the JET program. This is a program run by the Japanese gov't and places teachers in the Japanese school system. However, the next wave of teachers come in Aug. and application deadlines are somewhere around October/November. Here is the link to that program:
www.mofa.go.jp/j_info/visit/jet/index.html
As far as qualifications are concerned you do not need a TEFL cert. but I would recommend one, even an on-line one. There is a strong possibility you will be sent to teach your first class with very little instruction if any. (You do need a college degree to work and obtain a work visa.)
Here is the site for the largest EFL recruiters in China (they claim to be anyway.) Evidently they are looking for people asap
http://www.yakup-international.com
That ought to get you started at least.
Mark
