Getting your EMT is pretty easy if you can find a program. You can usually find fast programs at community colleges that take a semester and then you sit for the national registry or state test. The hours on an ambulance vary. I used to work full time and you're looking at 50-70 hours a week (more if you want). As an EMT this will get you about 28000-32000 (estimation) a year. The pay is usually hourly and it varies depending on where you work and from state to state. I think it's a great way to get experience for pre-med. The field is usually pretty open to part-timer's too. The type of EMS services can be different. At one service we have stations and run 24 hour trucks. The full-timers are 24 on 48 off. The other service runs system status where we get to stay in the trucks and post around the city and county all day (generally 12-14 hour shifts rotating). Hope this helps.