Former Army Medic here. CPR is a good starting spot. sometimes you can find some BLS courses, but the ALS courses are a bit harder to come by. Learn how to treat some common basic wounds; splinting a break, learn about the different types of fractures. learn about the different degrees of burns, how to treat them. Trauma is pretty easy to be completely honest, it's just having the opportunity to learn. I still have a bunch of my old manuals and stuff from my time at Ft. Sam. I don't know if anyone wanted to scan and upload them as a resource, i'd be willing to mail it to whoever would like to read it.