Nursing prereqs include general classes: English, Math, Speech, Ethics, Psych. Also a lot of sciences. Basic Chemistry and a lot of bio (intro to bio, anatomy and physiology (normally two classes), and medical micro biology.)
ADN is a degree that you earn from a community college it's considered a two year degree, but normally takes more time than that.
a BSN is a four year college degree.
Both degrees are RN, but if you want to advance you'll need a BSN first. I've also seen a lot of midwife schools that want you to have a couple of years of L&D experience before they'll accept you as well.
I'm a potential midwife. I've looked a lot into it, but lately I have found other areas interesting as well. My best advice it forget the time, forget the money, and just go for you passion. You'll have a lot of oppertunities to work within nursing. As a volunteer, nursing assistant, an RN once you earn that degree. Also be open for change. You might get into an area of nursing and find your passion is geriatrics. Go with the wind, and keep an open mind