Pretty much what Michael has said what you need to do. Each NASA region is a little different. But, NASA will get you on the track fast with instructor in our HPDE program
http://www.nasaproracing.com/hpde/index.html
Now, once you move through the different levels of HPDE you'll be able to do a NASA race school, or some regions use their HPDE as their Race School.
Once you get this far you should be ready to get you Provisional License.
http://www.nasaproracing.com/proracing/license.html.
But, the HPDE program is great, because you can use your future SF car in the driving program up until your ready to race. But, Seat time is important.
Also hardy anyone has big money sponsors. This is an amature racing series, and we all love our hobby