sourdough starter

Hello, I am a new member to this forum. My name is Stacey Klaff, and I attend a culinary school in Phoenix, Arizona. It's called the Art Institute of Phoenix. Anyway, I was interested in knowing if anyone can tell me how to make a sourdough starter. My family is in love with sourdough bread, and I would love to know how to make it. I know that it's probably time-consuming, but I just happen to have a break coming up from school, and would have plenty of time to "test" it out. I would appreciate any input anyone could give me. Thank you!