Lesson 1 is that you don't make an A. The girls get an A from you. I know girls want me, and I make them chase me. Combine that with the basics (dress well and go out and talk to girls) and you're halfway there. But don't think "basics" means easy; you'll be surprised at the number of excuses a perfectly normal guy will make not to say hi to that girl.

Man up, walk over to her, and say "Hi. I thought you looked cute and wanted to meet you. I'm Robert." Repeat times 1000. That was your warm-up. Now things should feel much more natural and you will understand a whole lot more about social interaction.