Hi Chris,
One of my friends and his wife are paramedics. In fact, he was training to be a paramedic when we house shared.
IIRC the course started with quite intensive studying and exams which several months. If passed, then it's onto on the job training in an ambulance with a trainer. They also go onto a driving course and get taught how to drive a ambulane quickly. I can't remember how long this all lasts, but at the end of the course they spend a couple of months at a hospital learning to give injections etc. which after they become fully qualified paramedics. By they way, while they are training they are on a reduced wage
Like Trev-R says the pay is crap. IIRC paramedic pay is roughly the same throughout the UK. So, if you life somewhere with a high cost of living it can be difficult. They are able to apply to the key workers mortgage scheme which means they can get 25% cost of the mortgage loan.
I think if your a not a money person and can put up with the shift work it' might be for your son. My friends seem to be very happy as paramedics and always have some good stories to tell.
HTH
Cheers
Mark