A pattern I seem to follow a lot.js

(function($) {
  
  $.fn.extend({
    pluginName: function(options) {
      // Initialise the class
      new PluginClass(this, $.extend({}, $.fn.pluginName.defaults, options));
      // Return this for chaining
      return this;
    }
  });
  
  $.fn.pluginName.defaults = {};

  function PluginClass(element, options) {
    var element = element,
        options = options;
        
    init();
    
    function init() {
      // Do stuff
    };
  };
    
}(jQuery));