Re: Unsure as to how to approach girl I haven't spoken to yet
You could try this little trick. It relies heavily on body language though so I'll be as clear as I can.
Write down your number along with your nickname. (Mine is BatMan obviously and I also had drawn a little bat symbol.) Aftwards proceed to approach her. Smile and look her in the eye when you do this and don't waiver. Hand her the number and say "In case you feel like taking a chance." Then walk away. I'd even do a little look back and smile after walking away. Again its all in the body language. Hope this works for you. Good luck.
"All things are subject to interpretation. Whichever interpretation prevails at a given time is a function of power and not truth."