Street tires can be very tricky to launch on in a 5-speed car, so I like to take as many complications out as possible; the main one being the clutch.
1) Spin the tires a few times just to get the chit off of them.
2) Left foot on the clutch, right foot on the brake, let the clutch out until the revs drop to about 600 RPM. The car should be moving on it's own, only being held back by the brakes. Actually, the car should actually pull pretty hard for not using the gas pedal.
3) Prestage the car doing this, holding the clutch in the same position that allows it to be semi-engaged.
4) Letting off the brakes (SLIGHTY), creep into the second beams until the car is staged.
When the light goes green, it makes it much easier and your launches much more consistent. You just have to find the happy medium between too much, and not enough throttle. Engaging the clutch before the green, takes the guess work out of bogging or spinning.
Then again, that is just me....
Joe