That's the beauty of the new concept though. It can be anything. You can talk about religion or politics, and if you piss someone off and they want to counter point, then they can do a segment the following week addressing the other side of the issue.
As for mic technique, try between 4 and 8 inches away from the mic, and always speak directly into it, never across it, as the levels of your voice with fluctuate and make it a lot harder on the listener.
Don't be afraid to PM me asking anything. I'm taking this seriously, and I'll help you out with whatever questions you have. Also, feel free to record a soundbite and send it to me over AIM. If you're unsure about your technique or anything you could do to make your voice clearer to a listener, I'll help you out.