If you are "new to Perl, but not to coding", you might get the best mileage out of Perl/Tk -- get that installed, if it isn't installed already, and then as soon as you can, run the "widgets" demo script; it will show you how to do exactly what you want to do. This is one of the cleanest and most effective demo programs I have ever seen; I used it to learn Perl/Tk myself several years ago, and it's only gotten better since then.

Between the demo code and the perldoc man pages (for perl generally and for Tk widgets specifically), you should be able to get off to a quick start.