Hi Niel,
As a background, I am still in the Philippines trying to find where I should focus my efforts in -- is it the US or Canada. But to answer your question:
1. I don't know if there's any Facebook groupI've tried looking and there are also no agencies. You have to do it mano mano. However, incidentally I recently got to chat with a Filipino who just started her Physiotherapy application for Canada. And she informed me you can start the credentialing process from the Philippines you won't need to be in Canada. Just look for the steps and forms on CAPR.
However, if you have a friend/ relative in Canada - it's better if you put their address on the forms instead because they will just use the address to send forms back to you.
2. I don't know if there's a need to study again (I still think this depends on the school and your curriculum). What I'm sure though is the need to study the Canadian healthcare system, which you can do online. My friend's advise is to start credentialling (takes around 3 month) then while you're waiting take the Canadian healthcare subject (takes around 1 month I think) and then when they give you your feedback at least you can submit your lacking credential.
Please let me know where you are in your process, would love to get a support system in this. haha! Good luck!