If you want to be good at anything, you need to practice. This is applicable to everything and that includes driving. As a newbie driver, you need to learn new things. Follow the instructions and do it over and over again till you get the hang of it.
This game has many goals and you need to conquer all of that to be able to advance to the next level. Each goal has some reward that you will only get if you beat the challenge. You can use the money to upgrade your car. You will also unlock more cities as you make some progress in the game.