For all JETs from the United States, you can get help with your U.S. Taxes using the Kumamoto (熊本) JET tax guides. They are available from the Kumamoto JET home page: http://kumamotojet.com/U-S–Taxes.php.
Note: First-year U.S. JETs will not be able to file for the Foreign Earned Income Exclusion through the Physical Presence Test (2555-EZ, Part 1) until later this calendar year. Please make sure to submit the change of address form, though, as well as the extension when the time comes.