The home screen of this game gives you several different options. You can choose to do a Practice Lap, 5 Lap Race or 10 Lap Race. If it's been awhile since you've played any racing games, you may want to choose the Practice Lap option to get back in the swing of things. Otherwise, you should have no problem quickly picking up the game by selecting the 5 Lap Race option.
Once you click that option, you will be taken to a pre-game screen. To actually start, press the red arrow in front of your car. What makes this game fun is instead of using the arrow keys to steer, you actually use your mouse. Just make sure you stay steady and on track so your car isn't destroyed!