try to create a new action in module

using the doc
I'm trying to create a new action that send an email to every user in the selected role groups.
This is useful for workflow changes to alert editors that they have nodes to review.
but to start i'm trying to generate the form and can't get it to work

I someone can't help me start
thanks
here is the code that is note working

function mymodule_outil_action_info() {
  return array(
    'mymodule_outil_action_mail_to_role' => array(
      '#label' => t('send a mail to a role'),
      '#arguments' => array(
        'user' => array('#entity' => 'user', '#label' => t('Recipient')),
      ),
      '#module' => t('Token'),
      '#description' => t('You may use the token replacements for the mail\'s message body as well as the mail\'s subject.'),
    ),
  );
}

function mymodule_mail_to_role_form($settings = array(), $argument_info) {
  $roles = user_roles();
      unset($roles[1]); // good bye anonymous users!
      //unset($roles[2]); // good bye authenticated users!

      $form['recipients'] = array(
        '#type' => 'checkboxes',
        '#title' => t('Recipient Role Groups'),
        '#default_value' => $edit['recipients'],
        '#options' => $roles,
        '#description' => t('Select which roles should receive this email.'),
    );

      $form['subject'] = array(
        '#type' => 'textfield',
        '#title' => t('Subject'),
        '#default_value' => $edit['subject'],
        '#size' => '20',
        '#maxlength' => '254',
        '#description' => t('The subject of the message.'),
      );
      $form['message'] = array(
        '#type' => 'textarea',
        '#title' => t('Message'),
        '#default_value' => $edit['message'],
        '#cols' => '80',
        '#rows' => '20',
        '#description' => t('The message that should be sent.  You may include the following variables: %site_name, %username, %node_url, %node_type, %title, %teaser, %body'),
      );

  workflow_ng_token_replacement_help($form, $argument_info);
  return $form;
}