When approaching an emergency scene what is the first thing you would do?

If you are on the scene of an accident and there is someone who appears to be injured, for example this person is on the ground and not getting up, or is bleeding heavily, or seems to be unconscious, and if you have some training in first aid, and if there is no more qualified person than yourself who is already delivering first aid, then you should by all means deliver first aid. If you are not trained to deliver first aid you can still phone (using the 911 emergency number if that service exists in your area) to get help.