[TYPO3-dev] missing output

[Roman Pretory]

Hello

I use Typo3 7.6.4, PHP 5.4

) create an extension with the ExtensionBuilder  ... to show this elements on normal Pages
) only for frontend no Frontend Plug-Ins or Backend-Modules
) create new model without any action
) create Properties like title->string, link->string,...
) Install extension and create new elements on page 
) Install extension, clear all caches

after that I add seen on (https://docs.typo3.org/typo3cms/ExtbaseFluidBook/b-ExtbaseReference/Index.html#registration-of-frontend-plugins)
public function initializeAction() {
 echo 'hello Word';exit;
}
public function indexAction() {
 echo 'hello Word';exit;
}
And create ext_localconf.php:
if (!defined('TYPO3_MODE')) {
	die('Access denied.');
}

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
	'RPretory.' . $_EXTKEY,
	'Links',
	array(
		'Links' => 'index',		
	),
	// non-cacheable actions
	array(
		'Links' => 'index',		
	)
);

if i look in the Frontend of this side no hello Word no debug message, no change normal template output without content
Looks as this extension is not installed.

Whats missing.

THX Roman