There is no such thing as an "enlisted officer."

I don't know that much about Navy programs (being USAF).  However, you could probably find a lot of information by talking to a NROTC commander (hopefully one at your school or near you).  Also, you could go to the official Navy site and poke around.

http://usmilitary.about.com/od/navy/l/blcommission.htm

This has a general overview of Navy commissioning programs.