Hey janker where in Ontario are you from? Thrive Games is in Hamilton :D
Government incentives - your research should begin here:
http://www.ontario.ca/ontario-government A quick google query of Ontario funding programs would be your best bet, and then start sifting through those pages looking for something that could apply to you. There are a lot of incentives you can find without a finished product, and if you dig hard enough you will get to them. I have already done all of this research and would be willing to share if absolutely necessary, but try to find it for yourself first. If lost I'll point you in the right direction.
Also from my experience, aligning yourself with an incubator or start up accelerator might be very beneficial dependent on your team size. They provide answers to a lot of these questions, and some even provide free office space. I can provide more info there if needed as well.