I agree with prairienurse. Start by talking with local schools
that offer nursing programs
. Start by learning about the prerequisites. Take a few classes, begin slowly so you get a feel for study habits and how to be a college student. It's very self focused, and some instructors expect you to figure it out or yourself.
Then, when you are successful in your Pre-reqs the school will be able to direct you regarding the application process to the nursing program. Every program is different. Many are looking for the pre-reqs, your GPA, and some sort of entry examination (TEAS for example).
Remember, nursing is not a direct entry program. There are criteria to meet, an application process, and then a very competitive selection process.
Good luck in your pursuits. Also, try posting in the state section for your state of residence so you will get more specific responses for the school you are hoping to apply to.