Now from where to start. Since I have modeled the E36 4 times and also I own one I know that car almost perfectly.
1.st You are not modeling an M3 (here is how a M3 looks like:
http://www.car-catwalk.com/cars/BMW_M3_(E36)_ograms.jpg )
2.nd If you are not modeling a M3 then you are modeling a standart E36 and here how it looks:
http://www.bmwchubbs.com/sig.jpg
3.d Here is what you have to fix before even continuing
P.S. search for my E36 threads and see the difference