practice practice practice
even if you have a million passes under your belt, each car is different
with time you will find that ideal combo of burnout, launch, shift points, etc
dont spend any money until you squeeze everything you can out of your current setup
are your nittos drag radials or street tires? if they are street tires, it would be smart to get drag radials as even a stock stang cant hook up on street tires
if they are drag radials, heat em up!! they need a solid burnout to get the best traction