Dating Sites Reviews Forums

I work in the mail room and there is this secretary I really like. I see her a couple times of day in passing but our interaction is minimal. I have been introduced to her before so we know each others name. We also wave to each other if we pass in the hall. I do not date much and am shy. How should I go about getting to know her so I can ask her out on a date?

Other questions I have are

How much should I talk to her before I ask her out?

Should I wait till lunchtime or do it after work?

Is emailing her a better option?

HELP, I need some advice.