SoPW is a perfectly good place to post problems... that's what it's there for, and don't let the fact that it gets a lot of traffic make you believe that your questions won't get answered.

As for your column (if that's what you decide to do), I'd say post it to Meditations in small pieces, and when you get, say, five or six: post "A Tutorial for Perl to Teach Beginners, Part <n>" to Tutorials.