One correction. A person should not provide First Aid unless the person knows what they are doing. Especially if EMS is on the way.
Your intentions might be good but, do not render Emergency First Aid if there is a likely possibility that you may do more physical harm than good to the injured individual through ignorance.
The road to Hell is paved with good intentions.
If you are not qualified to perform First Aid then you should provide aid and support in the way of verbal comfort and try to passively keep the victim alert and talking.