American 121 - I am going to respond and I don't want any of this to sound dismissive or insulting. It is in no way intended that way.
The training is available through most Junior Colleges in Basic First Aid or Emergency Med Tech for a little more in depth. But basically there are only four things the 'average' citizen needs to remember.
1 - Call for help! If that means you need to dial 911 do it. If you have to yell at someone to call 911 do it. If you have to yell out for help don't ask for help. Don't ask someone or anyone to call 911. TELL/ORDER someone specific to call 911. Otherwise everyone will think someone else will call for help while they watch the action - They will turn into the OHHH! and AHHH! Squad.
2 - Airway - If is closed open it. If something is in the way move it. If there is breathing proceed to step 3.
3 - Breathing - If you have been able to clear the airway make sure the person is breathing. Lift the chin, get your face close to theirs and look, listen and feel. Look at their chest to see if it is moving, feel for their exhalations on your cheek (At this point you are also feeling the carotid artery for a pulse), listen for their breathing. If their is no breathing start with CPR. If their is breathing proceed to step 4.
4 - Circulation - Sweep the body - A leak check - are they bleeding? If they are try to stop it, or at least slow it down. The best way to do this is through pressure and elevation.
None of the previous is intended to replace professional instruction. It was typed merely for entertainment purposes - With the legal requirements out of the way...
Again, I don't intend to sound insulting but am trying to show really how primitive basic first aid needs to be. You are only there until the Pros show up. If you are a pro or have pro training you should have your kit and know how to use it.
Kits are over rated. The only thing a basic first aid provider may need is a pressure dressing. Sounds impressive, doesn't it? Get a 'feminine hygiene pad' or Maxi-Pad (same thing I believe) and an Ace Wrap. Apply the pad, wrap the wound with the Ace Wrap and raise the injured part above the level of the heart.
Yea, Blood Clotting powders or "Blood Coagulation Powders" should be left to the pros. Don't think so? Keep it away from the face, the patients and yours! If you don't do you know how to treat it? Best left to the experienced.
I hope in some way this helped someone...