[xkmkmlmx]

You seem intelligent enough to probably have figured out the number one rule (that is posted everywhere in this forum as well as any site that deals with teaching english in Japan), and that is you MUST HAVE a 4 year university degree to legally work in Japan. That is, if you don't go the other routes such as marriage.

I am sure other veterans here will have more info on the other stuff, but, again, "legally", what you're asking is probably not the best route. If you don't mind the risk though, I am sure there are opportunities out there for you.