Hello @Krimsingoste on the Lobby screen in the top left corner, tap the TWDS Cards icon. As you scroll to the right there are all of your card pages as you click on the pages the information in red under the Hero Card will tell you where the card will come from. For example, in The Pharmacy the Hero Card comes from Collecting the Lobby Gift and from Spinning the Daily Wheel.
Additionally, if you click on Hero Set (Daryl) there is a list of where each Hero Card comes from and how to gather them.
I hope this helps to point you in a good direction.