if you have a good personality it will just happen, be nice, not popular, and hold doors for people, help carry books, and dont dress like a slut, getting e-mails/numbers is a good way to start, try smiling in conversations, girls dont want a depressed friend, unless they are depressed to personalities attract each other.
Just start talking to chicks. Practice by talking to the ones that you are not interested in. That way it will be easier when you do spot one that you really want to get to know better. . Besides that, you may find one of the girls you were not initially interested in to be a real winner! . Be a guy who listens to women. Girls love that. All day long we go blah, blah, blah, blah, blah. A guy who actually acts interested gets our attention. Especially if he compliments us, or tells us that he would love to meet our cat because he loves cats.
Taalk to a girl as a friend. Not all girls will be the same but personally if a guy ramdomly asks me out then ill say no but if they put the effort in for a frednship first ill say yeah. Just compliment her all the time- that way if she don't likt you then you can tell that she doesn't and can pretend you were only kidding so it isn't awqwar, then move on to the next. But most girls won't form a close friendship with you if you compliment them a lot if they don't want a relationship :)