Air Force Nurse??

Hi I'm new to this site~

I recently discovered that I want to become a nurse. (CRNA OR Occupational Health Nurse)
I am a high school graduate~
I want to be a nurse in the federal govt (ex: Homeland Security, US Marshals, CIA, etc..), but i don't know how to pursue my goals.

My plan was to go to the Air Force as a Registered Nurse and then get my masters degree as a CRNA.

1.) Is it possible to serve in the AF- just being a RN?
2.) Does the military pay for graduate school? (to get Masters degree)
3.) SHould I enlist in the AF?

Any advice would be greatly appreciated!