buy lots of "Quik Clot" or "Celox" and plenty of "Kerlix" gauze.
Most of those do more damage then help if you are untrained. I know one of them you can only use for certain types of wounds, no head injuries, etc. They work great on what they are designed for, but if used wrongly, then they cause more damage and can even kill. They do have some videos about how to use them, but I would say you need more training then a youtube video if you don't want to accidentally kill someone.
Personally, I have some of the quik clot, but I have more of the regular bandages, since I have used them for way more then a decade, I know exactly how to use it, instead of trying to read the directions. And they are abit too expensive to open and test/play with in order to get the needed good training. Just my and im sure everyone is different with that.