I'd suggest installing DBI, with some database driver (if nothing else is readily available, then DBD::SQLite because it is easy), set everything up, and try to write a small database project. Something like a URL-shortening service. (Look at [link|http://www.notlong.com/|http://www.notlong.com/] if you don't know what that is.)

That will remind you of how Perl works, remind you how the DBI interface works, and remind you where to find modules and documentation for Perl stuff.

Cheers,
Ben