Read This, there is some great info in both the opening and the subsequent posts -
The two main airsoft groups based in and around Calgary are:
Joint Operations Calgary
I would personally recommend JOC, but thats just my opinion. Also, I would say reading all the Stickied threads above, as well as taking the time to get yourself age verified would be the two best things you could do for yourself as a new player.
Thats just my $0.02