Minecraft wiki entry for Your_first_10_minutes, associated text: If you see sheep, kill 3 of them, all the same color, to gather 3 blocks of wool (to make a bed). If you want to have an easier time later on by breeding sheep, leave at least 2 sheep alive. (It is still advised to kill sheep whenever you find them until you have three blocks of the same color of wool to make a bed, since a bed is extremely important and extra sheep can usually be found by exploring further.)