If your business structure is a partnership, corporation, or limited liability (LLC), you must register or incorporate with the California Secretary of State. Review the Secretary of State's LP Filing Tips before getting started.This business type requires you to file a Certificate of Limited Partnership (Form LP–1). The next step in figuring out how to form an LLC in California involves obtaining the appropriate business licenses and permits. CorpNet makes it fast and easy for you to form an LLC in California. File a Fictitious Business Name.