Hmmm. Good question. I always assume people will read them in the order I wrote them, which isn't in chronological order (show's linear sequence). I don't think you can go particularly wrong no matter where you start, but if it were up to me, I'd suggest: Red, DNR (oneshot), Dazzleland, Verbal (oneshot), Fire in the Hole, and then New Deal. I'd possibly throw in Cirque de Céline when you're done (especially if you've read Verbal), but it's more like a grace note to the action.