A Basketball. Basketballs come in different sizes depending on your age and whether you're a girl or boy. There are also different basketballs for inside and outside use. If you're buying a new basketball, make sure you ask the salesperson for help to figure out what size and type ball you need.
A Hoop. Basketball hoops are available in most gyms and in many parks. You can even buy a hoop and attach it to the side of your house or garage, if you have one. To create your own regulation court at your house, make sure you set your foul line 15 feet from the backboard. To see the dimensions of a regulation court, click here.