I would go with HackD on this one JT. I'm not going to tell you not to retail, if thats what you want to do then have at it, but start online/in your house first.
Airsoft in Canada is not even close to the same popularity as it is in the states, and our total population is a tenth of the US. The population of the area you are moving to is FAR to small to setup and maintain a physical storefront.
Check out our online retailers first, we have TONS. Look at their prices and see if you can match them while importing legally. If you can get P* stuff in at a competitive price, I know that is going to start growing in Canada, I am pushing it on everybody I can! lol
As for AV, Any official government issued ID will do. (passport, driver's license, etc.)
Both Kingston and Ottawa are very close and not much of a drive at all. At the moment I don't think we have any AVers activated in Kingston, but there are a few on Ottawa who will be more than happy to help you out.
Go up for a game on a weekend, im sure an Aver will be there to.