I am being served and don't know what to do, I'm being served for a car accident I had back in 2016. I now have 30 days to respond, can someone help?

Assuming that you had automobile coverage at the time of the accident, notify the insurance company ASAP.  It iwll provide you with counsel to represent you in the suit.  If the insurer raises any issues about coverage, or if for some other reason you feel that its interests are not the same as yours, you may want to hire your own counsel at some point, but for now the most important thing is to notify the insurance company.