1. You will continue to fly to Canada as a single applicant to become a permanent resident. No impact on your application, whatsoever.
2. If you get married, your application won't be affected in anyway. However, you will have to provide documents of your spouse to apply for dependent PR and pay the applicable fee (Medicals, Police clearance, RPRF and Application fee). You both will then get a new copr but the whole process will take some more time.
So, its entirely up to you if you wish to go forward and travel to Canada before getting married, or you can get married and update ircc about the status change, then apply for your spouse's PR application and then fly together at a later time.