[ImmortalZ]

Use your power brakes.

Hold down the brakes, blip the engine. You'll feel the pedal going lower. This is the vacuum assist doing its thing. Do this a couple times and you'll have maximum pressure on the brakes (which you will need with all that 3.5 V6 torque dumped on the wheels before launch). Then, rev it to a good range and let go of the brakes when the lights go green.

Remember, do not keep the revs and the brakes on for a long time. You'll cook your A/T fluid and damage the torque converter. This is why racing cars with automatics have a separate transmission fluid cooler.

[f450]

If you havent had much practice with the brake-rev method, I suggest you do the usual flooring of the accelerator. The brake-rev method is easy to mess up for beginners but is undoubtedly more useful if done right. So either practice that or use the easy way. Hope that helps.