Hi koss78a,
I'll give you a quick breakdown of the process and point you to a few threads to read through as there is lots of good info on the process and requirements as an applicant.
First off, 4 main things to be completed at your local CFRC (Canadian Forces Recruiting Center)
1. CFAT - Apptitude Test
2. Medical Exam
3. Physical Test
4. Interview with a Recruiting Officer.
(to be completed but not necessarily in the listed order)
Depending on how well you do on these items will depend on what trades you are able t qualify and then apply for, you can pick your top three but not all choose to do so.
Good luck and start the process soon as it can take quite some time to complete.
Here are a few threads that you should have a read through as well....
Army.ca Conduct Guidelines:
http://forums.army.ca/forums/threads/24937.0.html
Army.ca Recruting Forums:
http://forums.army.ca/forums/index.php/board,16
Threads on MP:
811 MP - http://army.ca/forums/threads/22155.0.html
811 MP - http://army.ca/forums/threads/22174.0.html
811 MP - http://army.ca/forums/threads/21786.0.html
811 MP - http://army.ca/forums/threads/26719.0.html
CF Recruiting Site:
http://www.recruiting.forces.ca/engraph/home/index_e.aspx
cheers.