Rot and Ruin by Jonathan Maberry

If you lived through First Night, you might collect trading cards.  No, not baseball or football cards.  Cards like this.  Cards with bounty hungers and famous zoms.

Maybe I should back up a bit.  First Night was when the dead rose up.  Zombies took over.  Fast zombies.  That was fourteen years ago.  Now humans have kept safe by living in small settlements with massive fences.  Benny Imura just turned fifteen, which means he has to get a job.  He could be an erosion artist, a spotter, a carpet coat seller, or a fence tester.  Too bad he isn't good at any of those things.  The only thing he can do is join the family business. Zombie hunting.