Gathering evidence is very important. You will want to gather as much information as possible, especially if the other driver has left the scene without providing you with any evidence. You will also want to speak with the other driver to get a statement of events and collect their information. This is information that can later be used against them by the other driver’s insurance company if it turns out their statements were untrue.
Get videos and photos of the accident scene, any road signs or traffic signals, vehicles around the accident, possible witnesses, and other things that you think may be helpful in proving a case. Keep track of all records of medical treatments, as well. Do your best to gather as much information as possible because it will be very important later on.