WordPress 3.2.1 with tinyMCE editor

I just can’t make a textarea work as the tinyMCE editor in a test plugin I’ m playing with.
I have tryied many different ways but don’t know what I’m doing wrong.
My last attempt was with the use of the_editor() and wp_tiny_mce() with wich I can see some buttons doing nothig without a place to enter text.

Here is the code in one of my attempts:

add_filter('admin_head','myplugin_tinymce');

function myplugin_tinymce()
{
  wp_enqueue_script('common');
  wp_enqueue_script('jquery-color');
  wp_admin_css('thickbox');
  wp_print_scripts('post');
  wp_print_scripts('media-upload');
  wp_print_scripts('jquery');
  wp_print_scripts('jquery-ui-core');
  wp_print_scripts('jquery-ui-tabs');
  wp_print_scripts('tiny_mce');
  wp_print_scripts('editor');
  wp_print_scripts('editor-functions');
  add_thickbox();
  wp_tiny_mce();
  wp_admin_css();
  wp_enqueue_script('utils');
  do_action("admin_print_styles-post-php");
  do_action('admin_print_styles');
  remove_all_filters('mce_external_plugins');
}

?>
<div id="poststuff">
<div id="<?php echo user_can_richedit() ? 'postdivrich' : 'postdiv'; ?>" class="postarea"><?php the_editor("<strong>hello world strong!</strong>"); ?>
<?php wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false ); ?>
<?php wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false ); ?>
</div>
</div>

I’ve entered the code above in the same file. Not sure where I was supposed to put it.
Also if this somehow gets to work could qtranslate plugin recognise the textarea and add its language tabs?