Yes, everyone will tell you to get age verified. See the link for details on that.
Airsoft prices in Canada are going through a dramatic change at the moment so I don't know if you'll get the same deals in the classifieds as you used to. Check out www.revolutionairsoft.com
they are getting a huge selection of guns in the next week or two and their prices will be the best around. I'm not an expert but if you value a good quality gun out of the box then it's absolutely worth it to spend a bit more up front and get something better than G&G. I just bought a KWA M4 and it's top notch.