Beyond going to a Perl conference, which is always great and will give you lots of energy and ideas, there are some very good companies that do Perl training, starting with Stonehenge (merlyn, brian d foy), and Consultix (Tim Maher). Look at their program or contact them to see if they have something available for you.

If you go with an other company, just check the reputation of the instructor, there are enough good ones available that you shouldn't have to use a bad one.