For basketball all you need is a basketball and somewhere to play. You can go to a local basketball court if you like. First you will need to know the basics such as dribbling.
Micheal Jordan, (pictured above) is one of the worlds most famous basketballer. He lives in the USA.
You might want to buy some things apart from a basketball, these include: shoes (converse are reasonable); you may want a hoop for your garden for when at home.