How leh?

How do you approach a girl you fancy? Maybe a teacher? A colleague? A friend even?

I have this language teacher that I think is hot. Seriously kawaii. Okay, but not on movie star kawaii quality, but close enough. But the problem is, I don't know here well enough to actually ask her out. She might have a policy against dating her students maybe. Or she got so fed up with so many male students asking her out, or she's already in a relationship.

I don't know...I really wanted to get to know her better. Maybe ask her out with a couple of her students? Or ask her help in some office shit, and then ask her out with the excuse of thanking her? Or just go straight up to her and ask for a date?

Tips?

Suggestions?