You can download my mission editing files .zip from here. It contains the DMA mission guide plus four files I have written that list the number codes for different things you need in the mission.ini file. One lists the car numbers (i.e. which model), one contains all the ped remap numbers (i.e. what colour the peds are), one contains the powerup numbers and one contain the ped types (i.e. how the peds behave).