No problem, happy to help. If you are a Permanent Resident then it is advisable not to leave the country for trips to Pakistan longer than a month or so (I'm not sure about the time but there is a limit). Being a permanent resident means there is a limit to how long you can stay outside Canada without it jeopardizing your spousal sponsorship application, which is why people caution against it.
But if you are a Canadian citizen then you can stay in Pakistan with your wife while waiting for the visa as long as you want, although be careful not to state that you are "LIVING" in Pakistan as then you will be considered a Canadian citizen residing outside of Canada. There's no need to mention on your app that you are "residing" in Pakistan. You can still be residing in Canada and applying for spousal sponsorship while you are temporarily visiting your wife in Pakistan after marriage.
Edit: You can also go to Pakistan in December and get married, spend some time there for 2-3 months, and then come back to Canada, and then at some later point while your application is being processed, you can go back to Pakistan for a visit. Going for a visit again can also strengthen the authenticity of the relationship you're showing (you can add to your app later that you went for a visit), although this may not be so necessary depending on what you submitted in evidence for your relationship.
Just make sure to apply for the spousal sponsorship application as soon as you can after marriage.