There are two ways in which you can crochet in the round. One is by making a loop with a chain of 2 or 4 stitches, the other is with an adjustable ring. Start with the chain method, and once you are comfortable single crocheting in the round, try to move on to the adjustable ring (it makes a much neater project). In the following video crocheting tutorial you can see how to make a circle, starting with a chain of 2. Notice how at the end you have small hole in the center. Learn how to single crochet in spirals by watching this instructional video.