A lot depends on where you can practice, most likely at a club if you're in the GTA, and what they have on offer. Some places do rimfire PRS to make the most of the distances they have, so a competitive .22LR rig gets you into that, and even if you're just practicing by yourself on a typical 100 yard/metre range a good centrefire is a laser beam that hits the same spot too consistently but a 22 is going to teach you about reading the wind and dialing the holdover you need at that distance. Even with experience and more than one rifle I still find myself spending quality time trying to reach out with my 22.
I'll second the recommendation about joining the ORA, but you still need somewhere you can practice.
I'll second the recommendation about joining the ORA, but you still need somewhere you can practice.