If you achieve Advanced Standing (Good grades, PFT, etc) you can commission when you graduate.
You apply like any other college, you can do it online. They also require Letters of Recommendation for application.
What scholarships are you talking about? If you mean ROTC, that's a whole separate process. However, if you apply you are automatically reviewed for Norwich based scholarships, and 95% of cadets there get some sort of financial aid.