The most important thing to do after you have been in a car crash is to get you and your family to a place of safety. It is usually a good idea to get everyone off the road and out of the path of oncoming traffic. If your vehicle came to rest in the roadway after the crash, but it is still drivable, quickly take some pictures of where the car is in the road if you can do so safely. After you take the pictures move the vehicle off the road and out of the way of oncoming traffic.
If someone from your vehicle is lying in the road, and you cannot move them because you fear they may have a spinal injury, take steps to warn oncoming drivers of the danger. Turn on your hazard lights, use road flares if you have them, and set out warning cones towards the direction of the oncoming traffic.
Once you have taken precautions against oncoming traffic, call 911. Stay calm. Tell them where you are at and if you need an ambulance.
Once it is safe to do so, get your phone out and take pictures of the scene. Get pictures of where the vehicles came to rest. Pay attention to the location and functionality of stop lights or stop signs and skid marks on the pavement, and whether there is other physical evidence on the road. It is also important to get pictures of the damage to the other vehicles involved in the crash since this might be your only opportunity to get pictures of the other vehicles before they are moved to a distant out of state location. Make sure you get the license plate of the other vehicle in at least one of the pictures. Finally, take pictures of the damage to your vehicle, both inside and out from as many angles as you can manage.