Edgy about calling her for the first time? Remember the ground rules and you will seal the deal! 
 
Ring her in the evening

Strategically that’s the best time; she’ll be outa office, relaxed and the best time to fix up for a lunch date for the next day.
 
Call her from a place where you are comfortable
 
Make sure you don’t have any company, otherwise you wont be yourself when you make the call.
 
Sound good

Women like their men to sound cool and confident.  Talk slowly and take your time with your words, make sure you don’t stammer or fumble, she’ll know in a jiffy that you’re nervous .
 
Engage in good small talk

Shun questions that border on the yawn-kingdom like the weather and politics. The best way to deal with this- talk about her!
 
Make her laugh

Humour is a quality that has always worked beautifully with girls. Try to drop a few jokes during the conversation to let her know that you have a sense of humour.