I would have to agree staying with EMT basic or advanced first aid course. From there if you are going for IV starting and such you will then need to have the medical knowledge of what to put through the IV.
If interested you would then take ACLS (advanced cardiac life support) and ATLS (advanced trauma life support). I don't know if these are offered to non-medical persons as every time I recertify there are only Docs and ER/ICU Nurses there.
You may want to look into the Wilderness Medical Society courses. They can be found online and offer search and rescue with Advanced Trauma first aid treatment that may be available to non-medical persons. Taught by instructors who have "been there, done that" they are fascinating courses that are certified.
As for good samaritan laws, they probably vary from state to state but at least here in Texas they protect physicians as well as non-medical persons provided you don't do something incredibly stupid.
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