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Details on opening a small corporation in ontario
The Canada Revenue Agency does indeed put out just the guide you want. It's at http://www.cra-arc.gc.ca/E/pub/tg/rc4070/rc4070-e.html - you should always take a good look at URLs to make sure they're really from the government and not from some for-profit firm that will charge you to fill out forms for free services. It covers ways to structure your business (probably a sole proprietor in your case), collecting and submitting GST or HST, sending in payroll remittances (if you pay yourself a T4 salary), and income tax including what you can deduct. It's a great place to start and you can use it as a source of keywords if you want to search for more details.