I know of three different methods to start, two begin with a chain and the other one begins with a plastic ring, yarn loop (i.e magic circle.) Which method does your pattern use? :think:
Follow this link to a drawing with instructions on how to begin crochet in the round.
Follow this link to a video showing the magic circle method used to form a very tight ring and leaving no hole in the middle.
Granny square patterns usually begin with the chain method. Amigurumi patterns usually begin with the magic circle.