Always a challenge.
My personal philosophy is do and say just enough to make people wonder about you when you are silent or absent.
With verbals, they are doing 70-80% of the talking, most of the time. You won't really divulge much emotional/personal content (if any at all) from yourself at least until you are exclusive. You will however engage her emotions regularly, but not provide unsolicited advice. Be warm in person and don't bad mouth people. A man deals with his own problems an does not share them with his woman.
All face to face contact should be 90% fun, 10% her opening up emotionally. Questions. Lots and lots of questions. And lots of deflection of her questioning of you - mystery.
With electronic communication, a consistently warm manner, but inconsistent volume, regularity and frequency. There are never more than 3 messages/emails sent without you arranging a face to face (and penis to vagina) contact. If she complains about your delayed responses - 'Sorry babe, work has been major hectic today. Let's meet for a drink tomorrow night'. Boom.
The tragedy of life is that cannot spend 24/7 with someone without getting under each other's skin; you always have to leave her (temporarily) before you both want. Your purpose has to be your priority, not a woman.
Whether talking on the phone or on a date, you always have to be the one to leave her wanting more, not vice versa. Phone calls kept to a minimum
Corey Wayne explains Indifference. I don't mean to bang on about this guy, but his work has really helped me shift in to another gear in the last couple of months:
https://www.youtube.com/watch?v=mGmQmPJJe_s