I'll try to answer some questions, and ask some more!
Are you already in college? If so, does your college have a NROTC program? If so, you could directly contact your unit through the recruiting officer. They can tell you if you're eligible for the College Program, which could lead to a scholarship.
The R means 'Reserve', but you will be commissioned to active duty as an unrestricted line officer. No different than the Academy.
As for military training, it depends upon the unit, but you will have at least one drill period per week, PT session, and various competition events. Your involvement could be everyday of the week, or just a couple times per week. It depends how much you volunteer to improve your leadership.
As for a scholarship, they're very competitive, but if you have a good GPA, good fitness scores, and get a high ranking from your local staff, then you could pick up a scholarship for the remaining time in college.
As for getting a pilot slot, theres a ton of threads on this, use the search.
In a nutshell, you'll put your service selections in at the beginning of your senior year, hopefully find out before Christmas where you're headed. This past year everyone who put Pilot as the first choice got it at Colorado, but it changes year to year. You just gotta take that chance.