Corey,
First of all, I am a newcomer to puaforums, and I just started reading "The Game" by Style. If you wanna pick up some literature, I would suggest starting with this, as it's stories as well as game thrown in one, and you'll learn a lot of the lingo in it.
As for your situation, you don't have a facial deformity anymore, so don't even think twice about it.
As for the girls, practice some openers on them, and don't even worry about rejection. Think of it as test driving a car, if it doesn't work out, test drive another one. First of all, if you're in class sit next to them about a seat apart, or diagonally in front of them(Work the angles) Some openers you might wanna use are, "Can I ask you're opinion, ___________" fill in something like tattoos or that you're friend thinks that spells work. You can also try "DId you see the kids fighting outside before?" Just use anything to get her talking, it's all basic stuff. Don't ask her boring questions, like where are you from, what are you studying. Be adventurous, ask her why she's distracting you from class, and stuff like that. Remember, it should be a privilege that she's talking to you. I can't give you much more than that, cause I'm new to these ways. My biggest thing in my game is to never ever think of what you're saying, just let it flow, and if you stumble, try to work out of it, or tell her you have to get back to the class thats being conducted in front of you.
-Doc.