I'm not sure if ERAU qualifies for the Blue 21 program. Your best bet to find updated info about this program would be to contact a recruiter. Generally speaking they have the most up to date info about these types of programs. I seem to remember Riddle once did qualify and then it didn't so I don't know where it stands today.
However, being a DB Riddle grad myself, if Riddle doesn't qualify you can still apply for traditional OCS and then flight school once attending OCS. The drawback to this plan is that you don't have guaranteed flight school but as long as your medically qualified, past the ASTB & perform well at OCS your chances are good for getting picked up.
To answer your question about training, to become a CG pilot you will attend NAVY flight school where you will fly various aircraft starting with the T-34, then if you go helos you fly the TH 57 or if you go fixed wing you'll fly the T-44 (King Air). On average it takes about 1.5 years to earn your wings and once winged you will fly your operational aircraft. Operational aircraft include the C-130, HU-25 Falcon and the CASA on the fixed wing side and on the helo side we have the HH-60 Jayhawk and the HH-65 Dolphin.