If he didn't come with a cage you'll need to get one. You can use a fish tank (but get a mesh cover in case he tries to climb out using the water bottle or wheel!) Oh, and he'll also need a water bottle and wheel. And get a small food dish and food at the petstore for mice. And you have to get bedding - no cedar though! Cedar is toxic to small animals. Oh, and don't feed him cheese! It makes them sick. Peanut butter is a yummy treat though.

Good luck with him!