The few things I remember from a First Aid training I received quite a long time ago are fairly simple and apply to any kind of accident:
1- Protect the area, the people who might be around the scene, any traffic (especially in urban area), hot cables and stuff that might make things worse.
2- Alert the Emergency crews: have a look at the "victims" (are they conscious/unconscious, responsive/non-responsive, injuries...), taking all the necessary precautions (any rotating blades, fuel leak etc.), to inform the medics BEFORE step 3.
3- Rescue: the bottomline here is to not overestimate your skills, if you've been trained to do anything then do it but if not, don't make (again) things worse by releasing a pilot with a 1000 pieces broken leg for example, the qualified people will do it properly.
Basically the idea is to secure the scene to wait for the rescue team.
As a helo pilot, I would be very cautious as to intervene on the chopper, even if I knew how to fly it. A crash situation is a completely different than just starting/flying/shutting down the thing...
My 2 cents...