Who told you that?? I was a paramedic for several years in D.C., went to nursing school, and do not work in a trauma unit currently.
If you want to be a nurse, go to nursing school not EMT.
Ditto Island on the flight nurse...not worth the risk. You also will have to have TNCC, and several years of ICU experience to even be considered for a flight team.
I'm not sure you have realistic expectations for the future right now. Nursing school= 4 years, Med/Surg experience= 2-3 years, ICU experience= 3-5 years, then you will be considered for a flight team, if they're still around in 10-15 years.