Rear camera also. Might as well take the ceiling down that is the easiest part. I am in the middle of the same thing right now. I have the whole ceiling sound deadened (mat) and then sound proofed (foam barrier), and the entire left side panels and rear door done with sound deadening mat and sound proofing foam barrier. The many various huge gaping holes in the sheet metal need to be covered by thin metal before you can put sound proofing products on top. You will want to put a layer on the inside of those holes before you cover them up as well. Follow the instructions here if you have any questions:

http://www.raamaudio.com/pages/How%252dTo.html

Did you only buy sound deadener? Normally that stuff is shining on one side, and sticky on the other. The primary function of that product is deadening the metal from vibrations not sound proofing. For a sound barrier you need a type of foam product as well.