After gathering information from the other driver and from witnesses, you need to take pictures and call the police to report the accident. The next step is to call your insurance provider at the earliest opportunity.
All major insurance companies now allow you to choose your preferred collision repairer, but you may need to ask the question to avoid being overly guided by the customer service operator.
You will be required to make a report of the accident giving details regarding accident location and time, any other involved parties, and the names of any witnesses. Next you can call your preferred insurance repairer to organise for the vehicle to be towed if needed.