The overriding importance is of getting medical and/or adult help as soon as possible.
you should know
- how to deal with severe bleeding
- how to ensure an airway is clear, and how you would carry out emergency resuscitation
- how to put someone in the recovery position
- how to treat a burn or scald
- how to recognise and treat shock
The links above are on the Red Cross Everyday first aid - web pages.
Vinnie Jones shows you how to carry out emergency resuscitation (CPR) below