Depends on what transfers from your current BA and the requirements of the school you attend.
I'd start off by going to http://www.allnursingschools.com they list the different types of programs available including fast-track degrees for people with existing degrees.
It would also behoove you to find out what nurses are saying about the Nursing field. Visit http://www.nursefriendly.com/views
You'll find articles from nurses detailing why they would and would not, recommend nursing at this time.
Hope that helps.
Andrew Lopez, RN
http://www.4nursing.com