There are alot of different formats for resumes. Go to the library and pick up some resume writing books, make a list of your storng points that would help you get the job you are looking for. Read the library books, and figure out what format would work best for you and your situation. Also, if you have access to someone that can critique your resume, have them look at it. Writing a good one can really be an artform, and you want yours to be the best it can possibly be.
I am willing to bet that most people applying to an EMS job working on an ambulance (and not in administration) don't bother with a resume. By including one, it makes you look more professional than the other applicants, and that can help the employer remember your application over another person. Setting yourself apart from the other applicants is what will help you get the interview, and also the job, so do everything you can to accomplish that!