What happens next?

How to deal with a minor car accident
Mentally note the other car's license plate number, make, model and color.
There's a chance that the other driver may try to drive off, especially if they're at fault. As soon as your car stops moving, look at the back of their car.
Note the license plate number, and keep repeating it out loud until you can write it down. Do the same with the make, model and color.