Okay, I count two actual questions in here, so I'll give 'em a try.
What is the best career path for someone looking forward to becoming an officer/pilot in the RCAF?
Do you mean what program of study? Might I suggest mechanical engineering? Gives you something to fall back on in case it doesn't work out for you.
See about a thousand other threads in these forums for examples.
It's been said that for every 800 people who walk through the doors of the CFRC wanting to become a pilot, one actually earns his wings.
That person then has a ~25% chance of being selected for the fast-jet stream, give or take, depending on the needs of the CF.
For ROTP, you'll be going up against applicants with 90% averages in high school, captains of sports teams, hundreds of volunteer hours, 6+ years of cadets, maybe some with experience in the reserves, and maybe some who already have their pilot's license. Hopefully, you've done a thing or to that will make you competitive.
You have a passion for aviation? Why not become a commercial pilot? Why limit yourself to fighters?