What should I do about this incident.?

this is likely his parents address if he was young, and probably not where he is, if your car is drivable you are lucky. In terms of what you can do at this point since his insurance is not valid, you need to tell the state of california he rear ended you and had no insurance this will get his license suspended. what you also need to do is provide CA with the damages because he will have to pay them to get his license back, so thats one thing you can start. Go get an estimate to fix your car and send the forms to CA DMV and be sure to mention his expired insurance and unpaid damages. If you have his license number and full coverage on your insurance they will likely fix your damages and go after him. deductible may apply. If you have liability only your insurance will not help, you either find a local address (you needed his phone number) losing track of that made it that much harder, in the future,put it on your cell phone and call him right away or something. If you can find him, drag him through small claims court, if you cannot find him about the only thing you can do is wait while ca goes and suspends his license, but that may take a while, as dmv is slow.

Contact your insurance company. If you have uninsured motorist coverage they will fix your car and go after the other guy for you. If you're not insured, all you can do is file a hit and run report with the local police.

Contact the police and let them know the situation. They should be able to be of assistance.

look in phone book,give number to your ins co.if hit up back he is at fault

do you have uninsured motorist ( i think that's what its called) coverage if you do your safe your insurance will pay for you if you don't you can sue his ***.