Learn and MASTER the basic first aid skills first, then learn the advanced ones.

As an Industrial First Aid Officer for over ten years, i recommend taking a Red Cross Basic course first. I think the basic class is 1 day.
If you really want to get serious, then look at Wilderness First Aid(this is what we have here in canada).
However, i think the WFA course has an age limit of 16.

I recommend under NO circumstances that you try Airway insertion yourself(without proper training), as you may cause more damage to your patient. Because air is so precious, you really wouldn't want to mess anything up. Here in canada, the good semaratin act only covers you if you try to help someone with propper training and skills, NOT what you might have seen on TV or may have learned from an unauthorized person/teacher.

A skill you really have to master is propper usage of a pocket mask. It may look easy, but like any other skill, it takes practice to master it.

My congradulations to you and your thirst for the knowledge to help people.

good luck,

peace
al