1. you can use the web form
2. You should update the IRCC after your marriage irrespective of the status of your application.
3. It's better to leave the passport as it is. The address in the passport can be separate for husband and wife. Its easier for documentation that way.
4. You will have to arrange for the additional proof of funds
For further clarification. details are given in this link of IRCC you can fo through it.
https://www.canada.ca/en/immigratio...-electronic-application-on-section-a11-2.html