Trangzon: California is one of 9 Community property States, which upon death or divorce of a spouse to a marriage, property acquired during marriage is split 50/50. If you wish to change the nature of community property then it must be in writing. There is more than one way to do this and in certain instances the community property presumption will prevail.
Make a written list of your specific questions and take the list and your documents to an attorney. No one on this forum will be able to answer you as we are not attorneys. Many will do free consultations!