I didn’t get the question. If you mean you want it to last longer on your first time, one trick that has worked for some people is to masturbate a couple of hours before the date. But that’s like saying “work before a race so you don’t go too fast”. Since it’s your first time, you can’t calculate how much you have to do, and whether what’s left is good enough for the girl.
So the only real advice is relax, explore, take it easy, remember to use a condom. One of the good things about sex is that it actually gets better over time. You’ll probably blow it, but you can always have a second round and maybe get it right that time. And there’s always tomorrow :)