Start reading:
https://www.ucop.edu/residency/residency-requirements.html
https://www2.calstate.edu/apply/california-residency-for-tuition-purposes
http://extranet.cccco.edu/Portals/1/CFFP/Fiscal_Services/Attndc_Acctg/Residency/Residency_Overview_Document_2013.pdf