Now that you've got some Molotovs War Thunder Advanced Pack ready to go, hop into your car and follow the GPS to the Spanish Lord's Car Lot (just be careful to avoid hitting the gas pump as you leave, as it'll explode). Once you arrive at the Car Lot, exit the car and jump the fence.
Use the Molotovs to Destroy the Cars
Inside, you'll find two cars that you'll need to destroy by throwing Molotovs--it'll take two direct hits each. To throw a Molotov, place your Stylus on the Molotov icon on the bottom screen, then slide it toward the car--a trajectory path on the top-screen indicates where the Molotov will land, so once it's properly lined up, lift the stylus off the touchscreen to throw it. Just make sure you stand back and toss them from a distance to avoid being hurt by the resulting explosion.
Firebomb the Store