You cannot receive any promo cards or accessories by just subscribing to the premium pass.
These can be obtained from the premium pass exclusive premium missions or the Premium tab of the Shop.
1. Obtain them directly as premium mission rewards.
Home screen (leftmost button at the bottom of the screen) > Missions (button at the bottom-right part of the screen) > Premium (Swipe left on the screen) > Claim rewards from completed missions
2. Exchange for them at the Shop using premium tickets that can be obtained as premium mission rewards.
Home screen (leftmost button at the bottom of the screen) > Shop > Limited Time / Events > Premium > Exchange for them with premium tickets