You will need to find one, enroll in one, and once you are successfully enrolled you can call yourself a true homeschooler and can reach out to your current school and officially break up!
Well, you are paying taxes either way you slice it, so why not get some of YOUR money back to use towards homeschool? If you enroll in a charter you will receive funds each semester for curriculum and enhancement activities. You will be assigned a teacher (education specialist) who can walk you through the rules of engagement with the charter (learning record meetings, attendance, etc.) and can also help you find curriculum and outside programs that can work for your family.
You will experience much less hand-holding if you go this route. You will not have to follow the rules of the homeschool charter (attendance, monthly meetings with an education specialist, etc) but you will have to create essentially your own school and foot the bill for all curriculum and homeschool program expenses. You will need to file an Affidavit with the California Department of Education each year.