Obviously you put the car into your vehicles.img file and you're done with the first step. Second, the handling goes in the common/data path. Unless you have different handling for certain vehicles, you need to find where you line is in the txt, copy and paste it in the txt with all of the other lines. Thirdly(not sure if that's a word), as for the ELS, you import your config into te ELS file and then you go to slot control in which you want to find what spot your vehicle is in, make sure it's on and on the bottom you put the name of the config of the vehicle