I purchased this little guy today, and I just want to know what he is and how to best care for him! He has a slightly bumpy texture and the leaves are very stiff. Thank you!

A Gasteria, perhaps this one.

Gasteria 'Little Warty'

If this will be a house plant, it will enjoy the maximum possible amount of natural light. Ideally a position right in front of an unobstructed southerly facing window. Water well then wait until the soil goes fully dry before watering again. Your plant would enjoy a slightly larger pot in the near future.