How do i give her, her first kiss?

Just go for it. Anticipating it only makes it more stressful and you will be more nervous. Since it has to be at school.. I guess Id do it between cles, but Id try to be in a secluded area... pull her aside and tell her you need to talk to her. Then just KISS her. But make sure, you are more alone, because a crowd or audience will only make the whole thing more akward, and that it was you are trying to avoid. As far as the "how" its something that comes naturally, once you start doing it. JUST dont jam your tongue in her mouth. Its a first kiss for you both, so make it a small quick peck on the lips. And save the french kissing for once you have mastered the peck. :) Im sure it will go wonderfully. Good Luck. :D