This should help you get started.
http://www.biondoracing.com/tips.shtml#throttle
It takes time though. Going to need quite a few runs to figure out your ratio. Then you have to figure out your ratio in relation to the weather as well. Everybody has their own opinion on how to tune the car to the throttle stop. I don't think there is a definate answer to how you should do it. I've always heard that you want to go on the throttle stop as early as possible, as this will bring your MPH up. I go on it at .1, but I know some that go on it as early as a few thousands. Shermon Adcock Jr. waits for closer to a second before going on, at least that's what I've heard. I ran against him in a time trial in Gainesville, and he was quite a ways ahead of me after launch, so I think it might be true. Either that, or he runs a much higher throttle stop RPM than I do. All you can do is make runs, and figure out what you are comfortable with.