Serbinski Accounting Firms

I should also note that I am on a J-1 visa (I finished school in Canada however I came here in June for an internship). Do I still fill out form 8843?

I'm a Canadian citizen and moved temporarily to the US to work for a US marketing firm as an intern in 06/13. I filed form 8233 to be exempt from all withholdings (my income was supposed to be <$10,000). I made a little more than this amount and now I need to file a US tax return. Do I use form 1040...