Don’t forget to have some good potting soil on hand. I like Black Gold.
Place it where it will get filtered but good light. Water it by the tablespoon (how many will depend on the size of your terrarium) every so often. If it gets too foggy inside, open it and let it breathe for a few hours. Keep the soil moist but not soggy.
Congratulate yourself on adding a little more beauty to your surroundings.