How do you date? Honestly! What is the etiquette? How many dates should we go on? What should I do? Girls help?

I am a young man and have never had a girlfriend.Whenever I ask one out they say no! I have no experience with women. I am an only child who went to an all boys boarding school. How do I get them to go out with me? I particularly like Megan Fox and girls who look like her. Is there a way to be cool and a charmer? Please tell me if there is.