I am new to the GMing aspect of pen & paper RPGs and have started a slightly modified D20 Modern campaign with my friends a few months ago. We are five sessions in and I have material ready for another two sessions, but have found that I am having a little trouble coming up with quests and puzzles. The world space of this campaign is based upon Max Brooks' novel World War Z
taking place just after the fall of Yonkers. In other words, the world has just realized that the governments of the world are helpless to stop the zombie epidemic and everything falls into anarchy. Unlike the book, however, I am incorporating a wider array of undead that is not limited to the simple mindless walkers. Some are pulled in from the Left 4 Dead game series as well as a few of my own creations. Not to mention the likelihood of coming across groups of raiders and other humans ranging from the friendly competent survivor to the greedy or psychopathic raider.
So right now I'm interested in hearing from other people and otherwise just spit balling ideas around to see what we can come up with. With any luck, we'll devise all sorts of exciting missions that will keep my friends interested and excited in this game. Thank you all upfront for your help and let the spit balling commence!