Make sure you really like this boy because if you don't you'll feel bad about it later, ya know? No regrets is the way to live, so if you kiss him, mean it. As of "how to do it" there is so many ways to go about it - too many actually. There is a book I read on line about kissing that was pretty good, you should check it out:
http://kisslikeaprofessional.weebly.com/
It helped me.