Think about what you would like to major in and then start to look through and see what schools you would be interested in excluding baseball. Then make another list that includes baseball. I would not necessarily knock out D1's at this time. With your scores and depending on your grades you are Ivy material with baseball in the equation.
This is going to take you some time, but once you have your list, make up a profile of yourself and email it to the coaching staff of the programs you have interest in. This could go out right before summer and if you are on a summer team send you playig schedule.
You did not way what part of Canada you are from but there are teams from there that regularly go to the Az Fall Classic. I would check them out and go if you can the fall of your Sr season. In addition check to see if Headfirst, Stanford Camp, GPA, PG or other high academic events have the schools you are targeting.
Doing the above will give you the best chance to be seen and find a program that fits you. Also when you are at events like this be open and talk to coaches and ask them where they see you fitting.
The highly ranked D3's tend to recruit later than D1's as they are looking for the kids who have not singned NLI's but they are out recruiting early also so don't wait around be proactive.
Good Luck!