Been covered before, search around the forums. One of the members wrote up a good post about what newly qualified DP1 Reserve soldiers can expect, do, etc.
Google, CEFCOM and Canadian Forces deployments and you will get a website that lists all current Canadian Forces missions/operations.
For right now though, don't even think about what you could or could not do, you haven't even applied yet. Focus on picking a unit, talking with them, getting through the recruiting process. From there you can focus on your courses, and once you are DP1 qualified you can think about going off on taskings(if any are avail), etc As a DP1 qual troop don't expect anything too exciting, might be able to do a enemy force tasking, or driver at the Infantry School, etc.