Hi Ref18,
I'm from New Brunswick, but Nova Scotia is fairly similar as far as I know. They use FIBA rules for everything except college level (NCAA rules). If you're not used to FIBA, it takes some adjusting (not a big deal). As far as getting started, you would need to contact the local association in the fall and see when the meetings start and register with them. If Nova Scotia is anything like New Brunswick, I'm sure they're always interested in good young officials.
BTW, we have some quality universities in our neck of the woods. Dalhousie, Acadia, St FX, Mount Allison (which is in NB) all have good reputations.
The Nova Scotia Basketball Officials web site is
http://www.nsbo.net
Jay