Hey Zak welcome to calgary.
If you are looking to get bindings and boots the 2 best places to check would be mission snow and skate, and the source snowboard shops. Abominable tends to be much more expensive then everyone else although they do carry some brands that others don't (ie head and salomon).d There is another good place but i am blanking on the name.
For the hills in the area there are lots with in a 3 hour drive. Lake Louise, sunshine, nakiska, norquae (spelling?), castle, fernie, and Kicking horse. Also, if you want to ride park the hill in calgary (cop) has a good park.
If you are going to go a lot then you should pick up a Lake Louise card and a sunshine card. They get you discounts and free days. The lake louise card also works at other resorts and both will get you discounts on things like food, lodging, and even things like oil changes.