You need a cage suitable for your guinea pig and make sure it has good bedding. then it needs hay and water, buy a water bottle at a pet store and a hay rack. Feed your guinea pig veggies, pellets, and fruit, and make sure it has hay at all times Clean the cage once or twice a week and put new bedding in. You can also ask your vet on the best info on how to look after your pet. and read up on the internet and in books for more advice.