basic template

Hi, I would like to know what would be the php code for a basic template where i can get the content of a page to display like if I use the defaut template.

To explain more in details here is some explanations :

I want to create a different page template that i can apply to any of my site pages that woul work just you default template but where i can add some conditionnal php, apply filters or display a must login message instead of the content.

I already have something close to what i need, but it actually add some padding and margin around my content :

<?php
/*
Template Name: NEED LOGIN
*/
global $avia_config;
/*
* get_header is a basic wordpress function, used to retrieve the header.php file in your theme directory.
*/
get_header();

if( get_post_meta(get_the_ID(), 'header', true) != 'no') echo avia_title();
do_action( 'ava_after_main_title' );
?>

<div class='container_wrap container_wrap_first main_color fullsize<?php //avia_layout_class( 'default' ); ?>'>

<div class='container'>
<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('slider') ) : ?>
<?php endif; ?>
<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('property-search') ) : ?>
<?php endif; ?>

<main class='template-page content <?php avia_layout_class( 'content' ); ?> units' <?php avia_markup_helper(array('context' =>
'content','post_type'=>'page'));?>>

<?php
/* Run the loop to output the posts.
* If you want to overload this in a child theme then include a file
* called loop-page.php and that will be used instead.
*/

$avia_config['size'] = avia_layout_class( 'main' , false) == 'entry_without_sidebar' ? "" : 'entry_with_sidebar';
//get_template_part( 'includes/loop', 'page' );

	 $id = get_the_ID();
	 $page_data = get_page( $id ); 
	 $link = get_permalink( $id ); 

	$content = $page_data->post_content;
	$content = apply_filters('the_content', $content);
	$content = str_replace(']]>', ']]>', $content);

if ( is_user_logged_in() ) {
	echo $content;
} else {
	echo 'Vous devez être connecté pour accéder à cette page. <a href="/login">Cliquez ici</a> pour vous connecter ou vous inscrire.';
}

?>
<!–end content–>
</main>

<?php
//get the sidebar
$avia_config['currently_viewing'] = 'page';
get_sidebar();
?>

</div><!–end container–>

</div><!– close default .container_wrap element –>
<?php get_footer(); ?>