How to get in to Forensic Nursing

Hey Everyone!
My name is Ilia and I'm 17 and am going to be Senior in High School. I know I'm a little "young" to probably be here but I figured that I need help so I should go to the "EXPERTS". I live in Florida and I'm VERY interested in becoming a Forensic Nurse. I wanted to be a Crime Scene Investigator when I first saw the show CSI (kinda silly), but when I started taking Health Science 1 and Medical Terminology (Dual Enrollment) this past year I realized that I wanted to go into nursing. So I decided that I could go for an occupation that I can do two things that I want to do in my life, that's when I came across Forensic Nursing. I want to help people but then thing is I want to go to a 4 year university right when I graduate but in order to do that, I have to already have B.S. Degree and I can get my A.S. Degree next year while I'm a senior. What can I do to help myself "jump the gun?"
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i really wish there were more schools that taught forensic nursing. I live near Chicago and there arent toomany options in the area. Also after starting class approx how long does it take to finish. Thanks girls for all your help!