Firstly, after any car accident the first thing you should do is determine whether anyone has been injured in the crash. If so, apply first aid where appropriate and call for help where necessary. In Australia, the police must be called for any accident where a person has been injured. You must also call the police if the accident has caused a hazard or threat to public safety, such as a fuel spill or downed power lines.
If the accident is minor enough to not cause any injuries requiring medical attention or any hazardous conditions, then the first step is to exchange information with all others involved in the crash. This includes your name and address, the name and address of the car owner (if not you), the registration number, and any other information required to identify the car. If you suspect that the other driver has provided you with false information, or you suspect drugs or alcohol were involved in the crash, you can also ask police to attend.
After details have been exchanged and any information regarding the crash has been recorded (such as photos of the scene), you can then move your car if it is safe to do so. You can call for a tow truck directly, or call your insurance company who will often arrange this for you. If you car is still roadworthy after the accident, you can drive it away from the scene. However, keep in mind that some damage can be hard to detect. It is up to you to remove your own car from the crash scene. Police will not arrange this for you.