For people who own the Complete Guide to Wererats or Dungeon Crawl Classics #1: Idylls of the Rat King, here is something else on the web that you might think about using.
http://www.d20zines.com/html/downloads/ ... 20zine.pdf
On page 32 there are stats for a goblin wererat hunting party, which is meant to be used as a random encounter. I figured that they could be used as either a sign of what your characters will have to face in DCC #1 (they're EL 8 vs. the character's level of 1 to 4, put the PCs through a rude awakening) or you could use them as a hunting tribe belonging to the Redtooth Brood, provided under the free materials section of the Goodman Games website.
I just thought I'd add this since it would go along with either idea relatively well.