Most likely, someone has already asked the same question the you have and someone else has already answered it. You should do this before you think about asking a question in a newsgroup. Although newsgroups can help you solve your problem, they are generally not a help desk. If you are new to usenet, you should read the posts in news.announce.newusers which will introduce you to usenet culture, style, and ettiquette and help you avoid many embarrassing gaffes. Also, you should read a particular group for a couple of days to get a feel for the tone of that particular group.
Most groups have some sort of periodic posting that explains the group.
This group is for general discussion of the Perl language. However, this does not mean that anything tangentially related to Perl is on-topic. Don't post to the other Perl newsgroups if you have a CGI question. This group is for discussion of using the GUI library Tk from Perl. This group is for discussion of writing and using Perl modules.