Um, I agree with a lot of what bizdev had to say. Although the way it works in America is that you have to get Federal Employer Identification Number (FEIN). In Canada it looks as though you need a registered Business Number (BN), and it looks as though there is a website to get your BN: businessregistration.gc.ca I would recommend contacting an attorney however if you plan to license your business in any way besides a sole proprietorship.
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Nick
Personal Website - http://nicholasquinlan.com
Vyactiva Photographic - http://vyactiva.com