I use aperture priority for all my wildlife stuff.Very,very rarely shutter priority. Read the sports section on here, the two are related to a certain degree.
I don`t use Canon, so have no idea about your camera.Camera basics are not brand specific though. Sometimes you will need shutter speed, sometimes that will mean High ISO, sometimes everything will fall into place, sometimes not.
The most important advice is patience, if you don`t have that, pack it in now.
You can have all the best stuff in the world, but without patience and ,just as importantly, understanding, you will fail.
I always advise that you should go to your local park/pond/ bird sanctuary and practice. learn how your camera works and how differing settings apply. When you have done that, then the adventure begins..............
