Look at existing monitors for an idea of the content for each area (although they are generally self-explanatory). You can paste your code into the code block yourself or upload a file to one of the many free file hosters on the net (such as Google Code or Sourceforge) and link to it.
Add the following to the main monitor page (modify the respective info):
==== my monitor name ==== Summary * Download: [[monitors:monitor|monitor]] * Author: [[someuser@example.com|User Name]] * Compatible with: OS, lang * Last Update: YYYY-MM-DD \\ ----