This is the post that encouraged me to apply myself:
CSQ to Obtain an Open Work Permit in Quebec Post #7
As suggested, I used the tool:
https://www.canada.ca/en/immigration-refugees-citizenship/services/come-canada-tool.html to guide me to the application. The main form I filled was the IMM5710e: Application to change conditions, extend my stay, or remain in Canada as a worker.
In this form I selected: "Apply for a work permit for the first time or with as new employer";
Type of work permit: "Open work Permit"; and
Name of employer: "Empty"
to name a few important fields
Aside from required forms, the document I provided were:
1) AOR
2) Proof of medicals done in last 1 year
3) Valid CSQ
4) Passport Photo
5) Passport pages
6) Valid current Work permit
7) Letter of explanation, which included cover letter, as well as 1) and 6) as PDF
8) Payment 155 + 100 CAD
I applied 4 months before my WP expires, and it took 3 month to get it. There is a small remark on the Work Permit that says "APR pending". APR means Application for Permanent Residence, I assume.
I'm an inland applicant, PEQ stream.
Hope this helps!