Are you filing an inland or outland application? I'm assuming you are filing outland so you should start here: http://www.cic.gc.ca/english/information/applications/fc.asp#region There are 3 parts to the application -- your sponsorship application, your husband's application for permanent and country-specific requirements. For Mexico, you will need the guidebook for Latin America. Please read all the information very carefully and ask questions if you are unsure about anything. Good luck.