Hate to burst your bubble, but teaching English in Japan is not what it used to be. Unless you have at least a Masters, you will be limited to teaching at eikaiwas, most of which pay the least they can (250,00 yen a month) and screw you every which way they can for housing, insurance and though overwork. It's not a career. University work is the only decent teaching work, and only if you manage to get on with one of the very very few universities that treats its foreign employees like humans (I'm lucky, mine does). And most universities require a PhD for long-term employment.
You might check out this site for a realistic view of life in Japan...
http://www.debito.org/
Sorry to be pessimistic, but Japan is not the wonderland people think it is. It's economically depressed and racist as hell.
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