My biggest piece of advice is to go/live in an area where medics are paid a living wage.

Here in PA, they make bupkis usually. Out west I think most EMT-Ps are fairly well paid.

I agree with those that said get your EMT-P now, it's a long program but worth it, especially if your GIBill will pay for it. Additionally there are several schools that offer a BS in EMS Management, so that's something to consider as well. University of Pittsburgh is one.