I am managing several Moodle installations for more than a year. But I never developed anything for Moodle.
I would like to create a simple Moodle plugin that acts as a dashboard for many different custom DB queries I've created. This dashboard will be used by my clients' managers and supervisors to have an overview of the most important informations about grades, users participation etc. It should integrate in the Moodle enviroment (same header, footer, style and structure etc.).
I know there are already similar plugins for custom queries, but I would like to create it myself to learn the basics of Moodle plugin development and to create charts from them (maybe using the yui library).
Where can I start? I have enough experience in HTML, PHP, CSS and JS development... Could you suggest useful links for this purpose?
Sorry for my laziness but I don't want to waste time making useless things. Thank you in advance!