[jasonbvr]

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Anyhow, in regards to teaching other languages such as Hebrew, Swedish, Swahili or what have you, I would contact one of the big two directly requesting if there is a place for you in their company. The biggest two being Aeon and NOVA. Berlitz may also be worth a try. Legend has it, I would not know for certain, that NOVA has these multimedia centers that work with a number of different languages. The languages other than English that will certainly land you a job would be French, Spanish and German. Here is what I would write, feel free to copy, paste and use it as you wish:

Dear (NOVA or Aeon),

My name is (your name), and I am a native of (your country). I am writing to inquire about language services your company provides outside of English instruction. As a native speaker of (your language), I feel that I would be a valuable asset to your company and Japanese companies or persons seeking business or travel in (your country). Thank you for your time and best wishes to you and (company name).

Sincerely,

(your name)

I would email the department in charge of recruitment around the end of April beginning of May since in theory they will not be in the midst of a lot of hiring and have the time and patience to provide you with a decent response.

Regarding working private lessons on your own, it is going to be a bit more difficult to find students since your are not teaching English. I do not think that the income will be such that you would be able to support yourself on this income alone. Also, I will reiterate that working without a visa is illegal and you could be deported and fined if found out. Since it is under the table (illegal), no you would not pay taxes.