Ideally, you should enrol in a recognised first aid course so you can learn techniques such as cardio-pulmonary resuscitation (CPR) and mouth-to-mouth resuscitation under proper supervision. This will make you confident and capable of using first aid if you have to.
If a victim has spinal injuries, moving them may only worsen their injuries. You should never move a collision victim unless it is absolutely necessary.
The only instances where you should move someone before medical help arrives are when
If the patient is bleeding badly, you should try to stop or reduce the bleeding: