You can explore all of the cards available by logging in to your account, clicking on the Cards icon, and then viewing each one. By clicking on each card, you will also see the definitions your students see. If you want to build a card sort for all of your students that includes certain cards, just click on the Customize Your Deck button and click on the ones you want to enable or disable. All of your students will then see the same cards during their sorts.
If you want individual students to view only certain cards, click on your My Students icon, then click the student's name. Once on the student's profile page, click on Customize [name of student]’s Deck.