Medical Assistant's typically work in a physician's office, not usually in an acute care facility (such as nursing homes, hospitals, etc.). A CMA is a Certified Medical Assistant (they take a test to obtain national certification) whereas a RMA is a Registered Medical Assistant (to the best of my knowledge, they are trained and registered but not "tested" or certified).
A CMA holds no actual licensure whereas an LPN or RN does. Just FYI: I am an LPN and started out as a CMA. IMHO your best bet is to go directly for your RN. (You can get your ADN in 2 years. After completeing the 1st year of your RN program, most states will allow you to take the LPN test. That means that while you finish your RN you would be able to practice as an LPN and gain extra experience. The best of both worlds, right?)
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