We'd ask you to submit a government-issued photo ID, a selfie, and sometimes a proof of your residency. The whole process normally takes less than 5 minutes.
In order to activate your Revolut card, you need to enter your 16 digit card number on the 'Cards' section of the app.
For your own safety, contactless and online payments of your physical card are only enabled after you activate the card. You can also manually enable them via the 'Security settings' within the 'Cards' section of the app.