Tax calculation for 2011; Canada; Working holiday visa

[slk]

Hello,

I’m newcomer to Canada my visa is: Working Holiday (International Experience Canada).

I started a job on contract basis in November and I would like to get all things done with revenue agency.

According to my visa I can’t start my own company
I don’t have GST number yet.
I would like to pay taxes for November, December 2011.
I invoice my company on monthly basis.

Anybody knows where to start tax calculation?