No languages – first learn programming.
Then you’ll need (in no special order) JavaScript, HTML, CSS, SQL, and some server-side language (like PHP). And you should learn AJAX.

Then you can decide on whether to work with WordPress or Joomla (which are CMSs – Content Management Systems) – or build your own sites. For instance, giving users access to the site’s database, on a user-by-user basis (some can see certain information, some can only see other information – while some can modify some information) is trivial in PHP, but a bear in wither CMS