How old are you and how old is your girlfriend? The most important thing is to take things slowly and have great respect for her, that's "Doing love". If you are talking about sex, get some books and study first. There is a video, "How to make love to a women", I'm sure there are books, etc.... go to sex.org and look around and see what resources they offer. If you are too young, don't do very much, kissing, holding hands is okay, but wait until she is older and more mature before going past limits that you wouldn't feel comfortable of her parents finding out.