I bought a expedition 2011 without factory nav, but i want to get that added on

i secured what i believe to be a 2011 nav unit with hd radio and all
can someone point me out to some install sheets or something that shows part numbers for harnesses and parts i need, i think i need a amp but i dont know for sure yet

any help would be great, i believe it is approximately the same as the f150 possibly?