If you have any airsoft guns, it would be adviseable to sell them before you come, or atleast canabalise them for all the parts that you can bring into Canada. Essentially everything but the reciever would be permissable, thats the jist of it, its a little more complicated.
There is no requirement for orange tips.
There is no license require to buy airsoft guns.
Your in luck, there is a thread that was posted very recently that should cover alot of your questions.