Custom views filter questions...

Ok, I am been writing my own module for a little bit now, and I am now getting into views. What I am trying to do create a custom filter in views. Basically I will have a drop down with 2 options, and that works fine... but I am unsure of how to actually apply the changes to the view. Like when I select the one option, instead of showing my all the matching hits, it doesnt show me any hits. Here is my code:

// $Id: content_handler_filter_many_to_one.inc,v 1.1.2.5 2009/08/14 19:15:10 markuspetrux Exp $

/**
 * @file
 * The subclass simply adds properties,
 * for field-specific subclasses to use if they need to.
 */
class classifieds_views_handler_filter_seller extends views_handler_filter_many_to_one {
  var $content_field;

  function construct() {
    parent::construct();
    $this->content_field = content_fields($this->definition['content_field_name']);
    $this->additional_fields = $this->definition['additional fields'];
    $field = $this->content_field;
    $this->value_title = $field['widget']['label'];
  }

  function get_value_options() {
    $this->value_options = $this->allowed_values();
  }

  // Get allowed values from hook_allowed_values(), if any,
  // or from content_allowed_values();
  function allowed_values() {
    $field = $this->content_field;
    $function = $field['module'] .'_allowed_values';
    if ($this->value_form_type == 'select') {
      // Select elements accept multidimensional arrays to support optgroups.
      $options = function_exists($function) ? $function($field) : content_allowed_values($field, FALSE);
      // For selects, HTML should be filtered out and entities left unencoded.
      // See content_allowed_values / content_filter_xss / filter_xss.
      content_allowed_values_filter_html($options);
    }
    else {
      $options = function_exists($function) ? $function($field) : content_allowed_values($field);
    }
    /* the only thing i added is below */
    $options = array(
       0 => 'Private Party',
       1 => 'Commerical'
    );
    return (array) $options;
  }

}

I borrowed this from the cck module... since it seemed to be the closest fit for what I was trying to do. Can anyone explain whats going on in this code? Even a link to good site, or a reference to a decently commented example... thanks!