Wow, I've never seen anybody manage to put 3 questions into one sentence. Lol. You've got the desire to learn. I like that.
You really need to start with basics, my man. Learn everything from scratch. There are plenty of tools around this forum to help you. Just browse around until you find what you're looking for.
I don't know enough about the girl or your work to give you specific lines, but I wouldn't want to give them to you anyway. You'll learn nothing that way.
For the 3 specific questions you asked. Fixing aproach anxiety will help you talk to the girl and you won't know if she's into you until you approach and game her (search for "Indicators Of Interest" or "IOI") and you can find tons of great openers on the site.
There. 3 answers put into 1 sentence. I'm one of you, now.
Good luck, and start studying.
-June