https://learn.perl.org/installing/windows.html

That's quite an old version of perl. Today I think you should download a modern build from https://strawberryperl.com. So in reverse order:

• install Padre: from the command prompt: cpanm Padre. See also cpanm.
• Once installed run it: padre. This along with 'getting started' notes is covered by the documentation.

I'm unsure of the current status of Padre. No updates since 2013. I think this page could do with an update.