Getting your airsoft equipment can be expensive and exciting at the same time.
Your in a good location. There are indoor fields for winter play in the GTA, and some outdoor.
For the summer time there is Wasaga and Barrie. Both are paintball locations, but have airsoft on them on the weekends. It alternates locations.
Already mentioned...make sure you get AV'd.
These forums are full of good people and interesting posts.
Hope to see you out on the field this summer.