It's really a matter of learning the techique of working your left and right feet in sync. Throttle input and clutch release will be very different depending on the circumstances. Learn to drive the car sedate before you go ruining your clutch looking for perfect racing starts.
A good way to learn how to coordinate your feet is to find a slight incline. Stop in the middle. You now have the clutch depressed as well as brake. Now try to balance your car in the same spot just using by working the clutch and gas. Granted you don't want to slip the clutch too long but practicing this teaches you were the clutch begins to grab as well as how sensitve your throttle is or isn't. Become comfortable driving the car before you search for the boundries.
