The first thing you should do, after you leave the scene of the accident and finish dealing with police, is to be evaluated by a physician. Obviously, the kind of doctor you go to will depend on what injuries you have sustained. It is important to remember that not all injuries are immediately visible, and for some injuries the symptoms may show many days after the accident itself. The next thing you should do is to recall as much information about the accident as possible and in as much detail as possible. What were the circumstances? What were the road conditions at the accident? Was the driver on the phone? Etc. These questions should be noted down right after the accident occurs, but it is always good to review them sometime after as well. Finally, after gathering all the relevant information, you should reach out to a lawyer specializing in motor vehicle accidents.