Hey I know you're waiting for a much more experienced person to answer, and I'm sure he will when he gets to you haha, but since i'm procrastinating studying for my midterm I thought I'd share my thoughts
For a first year, these are the things I would focus on right now
1. Try to get Pharmacy volunteer experience this summer (relative who's a pharmacist, UHN has a lot of pharmacies), just so you can get an idea of whether you like it or not, know what the roles of a pharmacist are and what kind of skills you need to be one in the future, and having experience opens up your options to beyond just UofT
2. Get Dr.Collins for PCAT --> it's impossible to score significantly lower than 90% with Dr.Collins
3. Take PCAT this summer, so that if you got a bad mark, you can retake it the following november or even January
4. For the MMI's I think its too early at this point to think about them. But you can start by reading the code of ethics for doctors / health care practitioners
5. Select your majors right now, but don't focus on taking courses to fulfill your major requirements, just take the prerequisites you need for UofT Pharmacy if that's what you really want to do
6. Don't drop courses, take a full course load - unless you have a substantially bad mark in any one subject, try to keep the full course load