1. Get your passport, credit or debit card ready, and read the help document. The Department of Homeland Security recommends filling out the form at least 3 days before traveling.Fill out your form(s) online and print it. All required supporting documents for the form(s). Submit your customs and immigration declaration online using Advance Declaration up to 72 hours before you arrive in Canada. You will be required to complete a consent form. Among those exempted from this new requirement are U.S. citizens and travellers with a valid visa. Our form wizard will help you and your family know what passport form(s) to use. Here are 5 tips to ensure that your visitor visa application is approved: 1. Submit all Required Documents and Forms.