The world of supercars is tough since you would need to be the best to get some recognition and lots of money. Just racing won't make you much money as that is just barely enough for you. You need to upgrade your car and try to win the race next time.
Start your engine and step on the pedal upon the signal is given. Drive your car as fast as you can till you cross the finish line three times. You need to be the first car to cross the finish line three times to unlock a new level. You earn money based on the position you got each time you race.