Now then let's get started. First make sure you are doing this for real, not just for fun. I don't want to raise an army of jerks. Ok so you see a girl you like, that doesn't mean she will like you, so you should be ready for a rejection too. Ok so what do you do? A good thing to do is to find what you have in common (DO NOT ASK HER, just look on how often you see her at the same place you have to be).
Mostly everything works (classmate, she goes to a same place you do and etc.) This is for you to make sure you can see her at least once a week. If she is your classmate it is easy to talk to her, but if you both don't get to stay in a room where there are not so many people you should wait. She could start a chit chat, but if she doesn't, you should. Just make sure she saw you hare as many times as you saw her.
Also see if she has any friends around, because friends are here to show that you are a total stranger and you could be laughed at. SHE MUST BE ALONE. So, basically you go over and ask “Hey, so what are you waiting for? I'm in the (insert class here) class.” For this question to work you must ensure that she is going to some class too. She should answer. But if she doesn't say anything, just looks at you like a weirdo you should go away and find a better girl. If this works, start a small conversation. If you are good at joking try to a funny story or something (better see if girls like that one before you try to pull this off). When you go to your class and she goes to her class it's good. The stress is over. Try to chat again the next day and etc. This is a quick way to make friends.
For those who like their classmates it's even easier. The best way to be friends is to get a seat next to that girl (if possible and if you have a good reason to explain here why will you sit next to her) Then chatting will come in naturally and you will make friends with her. If it isn't possible to sit next to her try to talk to her on a break or something. If it's hard just use the tips above.
Now for part 2:
Ask her MSN or something, chatting is a good way to get a bit closer. After chatting with her for a month and making sure she has no boyfriend or so you can ask her to see this “great movie” and stuff, because your friends are sick or busy. You don't need to tell the truth, but it's easy to ask a girl out this way. Remember girls are not big fans of “Rembo” or anything.
The tastes meet on comedies. You should like them and almost all girls like them too. Now there is no telling what can happen on the cinema, it can be from hugs to kisses (don't get your hopes up) or from slaps and stuff like that. Here is where I can't help anymore, because there are no rules about love and stuff. But I can give a few tips:
A girl is always right. Her friends can be little devils or little angels. DO NOT show them that you are angry; you should always be happy and funny to them. On the Public is possible to meet your friends, and if you can try to get out of their way, because they can really mess thing up. If they got you by surprise and start making fun of you OR telling you thing that your girlfriend shouldn't hear just try to look angry and tell your girl that they are the biggest jerks in history (or something)
I hope this guide can help you all, but remember, what I wrote won't always be right, there can be surprises, just try to find a reason yourself, because I did.
Heartbreakers not wanted here!
I guess my guide is pretty good :)