If you want to file a wrongful termination case, you should first consult with an attorney to go over the facts of your situation to see if you have a solid case for wrongful termination. Keep in mind that in California, wrongful termination in violation of public policy requires a violation of a wage and hour or discrimination statute, for example. Your attorney can advise you on whether your facts will support a wrongful termination claim. For example, if you were fired based on having a physical disability or because you are transgender or because you are pregnant you may have a good wrongful termination case. Your attorney can help you to file a complaint in court (after obtaining the Right to Sue notice from the Department of Fair Employment and Housing if you have discrimination case).
