Cooperative homeschooling has become popular in the past twenty years. It involves a few families getting together one or two days a week for a couple of hours so parents can share their expertise in one or more subjects. Or an expert may be brought in to teach in an area such as science, art, or karate. If your child were to work four or more days a week with other homeschoolers, we would be inclined to say that he is attending a private school rather than being homeschooled which is essentially home-based education.
In the San Fernando Valley where you live, there are probably dozens of homeschoolers who are working together cooperatively. You should be able to find the names of some of these families by talking to your local school corporation. You can find a listing of homeschool organizations for a particular state on the Homeschool World website. Before you make a definite commitment to homeschool your son, talk to as many homeschoolers as you can. They will be able to tell you what is really involved in homeschooling a child.