I am going through the process now for my ATP. Go to the VA benefits website and search for the school that is currently approved. Once you see a flight school in your state, (hopefully, near you) then you can apply for benefits through their VONAP link (Veterans on-line application). The application asks for the school that you plan on using the post 9-11 benefits. This takes about 30 minutes. The VA will process you application and send you an authorization letter that you can give to the Admin office at the flight school. I do not know how you will request for benefits for schools that is not currently approved. You should call the VA and ask questions specific to your case. Good luck.