When I was in nursing school
this is how it worked:
2 years to complete all prereqs---basic chem, anat and physiology, statistics, microbiology, etc, social sciences and all those prereqs colleges make you take; once you do those and you get accepted into a nursing program is 2 more years of pure nursing school; in my case my 2 years had 4 clinical rotations: 1 in pediatrics, labor and delivery, psychology, medical surgical, and then 1 final practicum which was in an area or specialty you chose---such as intensive care, operating room, community health, etc. Most students chose their practicum in an area they wanted to work in, hoping they would get a job in that area when they graduated. Also, as you take those rotations, you also take classes in nursing foundations, etc.
When i went to school there were not that many informatics program. If you really like computers, maybe you should check out a health informatics program, and not sure if there are those; but google does wonders. If you want more into you're welcome to pm me; i have posted a lot posts with relevant info to your question....so you aslo need to read the old posts....cheers!