Emergency Room Procedure

Check to see if they have insurance.

stop the bleeding would be number one -- the patient would come in wearing a cervical collar (neck brace) and would be on a backboard -- precautionary measures to avoid paralyzing the person. With the irregular pulse, they would probably connect him to a heart monitor to keep an eye on the pulse. He would already have either lactated Ringers solution going or D5W -- if bleeding is under control. Lactated Ringers solution if the individual has lost a lot of blood and needs fluid replacement.
Other than that, they would probably just send him in for a CAT scan and other xrays, once that is cleared, they remove the brace and board -- if he has had a concussion, they admit the person overnight for observation (and most likely even without since the person is unconscious)

The Mneumonic is ABC

Airway (open airway)
Breathing (see if breathing, give puff if no breath)
Check pulse (begin cpr if no pulse)

Once that's handled, stop any bleeding, splint bones, etc.

All stages are to be aware of possible spine injury.

first responders will administer oxygen as soon as they can. Though they won't wait for teh tanks to do CPR if needed.

I dont know or remember the exact protocol for Paramedics but they may hook up an intravenous to put some fluids back in tocompensate for blood loss. EMT's don't do IV's. At least they didn't. That may be changing.

Probably one of the things the doc will do once the patient is examined and considered stable might be to do an head xray or cat scan or something given a big gash on teh forehead. Patient is breathing and has a pulse and is unconscious, then it might be a head injury, concussion, etc.