So I have this idea for a Discworld story. It takes place some time after the events in Monstrous Regiment (please tell me I'm not the only one who's read this). The set-up is that our hero, Pete Wentz, has enlisted in a military regiment consisting of several other unsavory characters, led by Sgt. Polly Perks. The problem is this: I suck at plot. I have some fleshy bits in my head--dialogue, character development and so on--but I can't think of what could, y'know, happen. Therein lies my need of assistance. Any ideas, no matter how small or vague, would be greatly appreciated.