Don't stair step.
If you want to be an MD, go straight to college, do not pass go, do not collect $200.
Seriously.
Your taking a year of your life out for Paramedic, taking 4 years for an RN, then 8 more years for a MD at least. Most kids who start the med school track at 18, are near or over 30 by the time they are on their own. If you want to be a paramedic, do it, and learn to do it well. Community puts on a good, but strenous program from what I have heard. If you want to be an RN, enroll in IUPUI or Ivy Tech now and get started. Do that first, then if you decide you want to be a EMT-P, go back to that. Trust me, this is coming from a economical stand point as well as an educational.