New around here and just found this, so I will resurect this and add what I can. Flying a PC-12. Part 135. Some hospitals have own 135 certificate and some use a vendors like Corporate Jets (CJ Systems), Air Methods, PHI, Omniflight... hospital and vendor owned both have their plus and minuses. Work 12 hr. shifts at a hangar. Home at least 10 hours a day or night. 5 on 5 off split between days and nights. Some trading to get a certain day off. Single pilot IFR so previous freight flying was a plus. Had 0 turbine time at hire. Fly average of 30-40 hrs. a month so not a real timebuilder. Slow turnover of fixed wing pilots. I want to say around 45k to start. Good aircraft. No real questioning for turning down flight. Some places require pilots to meet CAMTS (spoken as cames)(try camts.org) minimums which I believe is 3000tt. I won't venture a guess on the other numbers. Good people to work with. Sometimes fly all shift long and sometimes do nothing, so you will have to sleep during the day occasionally. Help load and unload sometimes 20lb. kids and sometimes 400lb. persons. Occasionally will fly with a mask because of patient having a nasty respitory problem. Things get interesting shooting an approach down low to an unfamiliar airport in the middle of the night.
Sorry for all the rambling but this is how it came pouring out of my head at 0300. There are plenty of websites out there for air ambulances. Try
http://www.flightweb.com/index.php and
http://www.nemspa.org/index2.php
those will get you started.