I need help with fixing my front end

Hey, I resently wrecked my 97 mustang gt. The front end is gone, the fenders and hood is all good but all I see now is like a metal bumber. I am fixing it myself due to not having full coverage and wasn't sure what all I needed. I know I need the header panal for the headlights, and the bumber cover, but what I dont know is what goes behind the bumber cover and if the are any other parts I need 2 get 2 get it looking like new again, any help is appreiciated thanks