There are many things to consider about buying a car, new or used. Please see the Welcome Handbook published by the Foreign Student Office for good advice about buying cars. Almost any insurance company sells car insurance. You need to call a few agencies to find out their rates. The first thing you should do is call the police, and then wait until they get there.
Insurance claims are easier if there is a police report.
If there are injuries, tell the police when you call. If the injuries are life-threatening, call 911. Cars, Phones, TV, Banking, Etc.