Follow this thread you will get an idea what is GCSM and howtoorder
https://www.canadavisa.com/canada-immigration-discussion-board/threads/how-to-order-gcms-notes-step-by-step-process.513893/
Here you go, everything you need about GCMS :
http://www.canadavisa.com/canada-immigration-discussion-board/latest-caips-gcms-notes-forms-and-how-to-order-t99210.0.html
Read this
How can I orderGCMSnotes?
https://www.canadavisa.com/canada-immigration-discussion-board/threads/all-about-gcms-how-to-order-read-general-questions-answered.482200/
If you are a Canadian Citizen or a Permanent resident you can order the notes for yourself and others, however, if you...
Read the following discussion, it might help you with at least understanding howtoorderGCMS notes on your application.
https://www.canadavisa.com/canada-immigration-discussion-board/threads/all-about-gcms-how-to-order-read-general-questions-answered.482200/
Not until after you've applied for them :P
(in an effort to be more helpful I will say 6-8 weeks after)
http://www.canadavisa.com/canada-immigration-discussion-board/latest-caips-gcms-notes-forms-and-how-to-order-t99210.0.html
It will take 1 month getgcms.com did a preety good job for me,yes you can order CBSA notes but i think you shouldnt at this time.
Whats your AOR?,if you ordergcms before 2 months chances are you will get less information.order CBSA after you have lapsed 6 months or more.
They have changed the process toorder the gcms (not sure what it means exactly, but its the notes on everything that has been done with your file) here is a link that tells about the new procedure toorder them online...