I went through this website
https://goes-app.cbp.dhs.gov/goes/jsp/login.jsp
Cost me $100.00 to fill out and file the paperwork. This included me in the "Trusted Traveler" program. I get Pre TSA check on flights, SENTRI and the card. I did take all of the requested paperwork but they did not ask for any of it. I would have it just in case. If you have sent in your paperwork go to the website and check the status. If they have accepted your paperwork you will get to schedule your appointment. Make sure you check all of the locations for appointment dates. Will let you know whey I get my card