Where do I put my export

For both exports in your scripts you should look for where your vehicle spawns, normally you should always look for "Spawn" or "spawnvehicle", if there is nothing similar look for the function or trigger in which the car appears, for example in esx_vehicleshop :

The "spawnvehicle" we are looking for is not there, so we look for the "buy" that happens when we buy the car and it is where we want him to give us the key