A good place to start is to run the widget demo (widget.bat) that comes with Tk, on my machine it is in Perl/bin.

There is also a website http://www.perltk.org/articles/index.htm.

There is a Tk Tutorial on this site too and a Super Search will return many excellent threads.

Not forgetting, of course, the Tk docs which include many helpful examples.

I have just started to use Tk myself but still occasionaly get stuck in spite of the wealth of information. But posting an example of what you have tried here and asking for advice quickly gets you on your way again.

Best of luck, expect to see your questions soon!

Update: Removed broken link to the docs. Also, I have just noticed that converter has many links for Tk on his home node.