I'm good at approaching women and take their phone number while it's all in Daygame. But after that, I just suck at talking on the phone and in the first meeting. I don't know what to say, what to talk about.

Any good Seduction DVD product on this topic?

I'm the absolute opposite lol. Let's trade?

What I've learnt in my limited experience:
I found David DeAngelo's book, Double Your Dating, really good for what to do with women on a date. Practice being cheeky and teasing the girl whenever you can and at other times contrast it with being very direct (after teasing her for a bit look straight into her eyes and seriously tell her that you like her and she really turns you on). Escalate physically early on - start with a hug and maybe kiss on the cheek when you meet, hold her hand soon after and spontaneously go for a kiss once you've been walking for a few minutes. Repeat and escalate throughout the night.

As for the on the phone, try and tease and her be playful. Get off the phone before it gets to the boring stage to keep her wanting more.

Might take some practice but doesn't it all...?

If you're particularly clumsy at conversation and need a really basic but really good primer then Stephan Erdman's Pimp Your Lingo series is pretty good at teaching you just how to talk to people. He says it's aimed at pick-up, it's not really got much by way of seduction stuff in it, I'd say it's more general conversation skills. Some good techniques in it for keeping conversations going.

Double Your Dating as mentioned above is good too for all the seduction stuff. Magic Bullets too, gives a lot of info on what to do beyond the first meeting.

Above all, learn to value your world. When I was younger I was never the greatest talker until i realised that my big problem was that I believed my life was dull and no-one was interested in it. Then I started seriously listening to other people and the big secret is... they don't give a fuck. Everything in their world is interesting to them. Women especially like opinions, feelings, internal stuff. Why you do something is as important as what you do to people, particularly women.