First you need to check with what school you want to go to (there's a list at the top of the page or you can go to www.allnursingschools.com
) Most schools require pre reqs like anatomy and physiology (1 year) Microbiology, Chemistry, eng, Algebra, Psy, Soc, and maybe some others. Some require you to take an entrance test like the NLN or NET (they'll let you know).
For my program I have to volunteer.
I hope that helps a little. There are a lot of schools in Philadelphia area (I see that you are in Chester County, I have family in West Chester)