First time out

Went to the track after several years of putting parts together on a very small budget. Watching it and doing it sure is different...lol. I need to learn how to launch. The first few times I tried foot braking it and it took off line a snail. The last run I tried the line lock and it launched alot better. My question is should I hold it with the line lock at partial throttle then floor it before I let go or try and let go and floor it at the same time. Please bear with a newbie but a fast learner.