Display content on Single page

I am building a single page theme, And I am having a problem with get_post_meta()

The Problem

This code bellow does not work, and I cannot see anything on the website as it’s blank. Here is my index.php.

<?php get_header(); ?>

<?php
   global $query_string, $post;

   query_posts($query_string . "post_type=page&post_status=publish&posts_per_page=9");
   if ( have_posts() ) : while ( have_posts() ) : the_post();
   $home        = get_post_meta($post->ID, 'home', true);
   $about       = get_post_meta($post->ID, 'about', true);
   $contact     = get_post_meta($post->ID, 'contact', true);
   $services    = get_post_meta($post->ID, 'services', true);
?>

<?php if ( $home ) : ?>
    <div id="home" class="borderline">
        <?php the_content(); ?>
    </div>
<?php endif; ?>

<?php if ( $about ) : ?>
<section class="about-us" id="about-us">
    <div class="container">
        <div class="row">
            <div class="col-md-12">
                <?php the_content(); ?>
            </div>
        </div>
    </div>
</section>
<?php endif; ?>

<?php endwhile; endif; ?>
<?php get_footer(); ?>

The code above does not display anything.

Question

• How can I display my content using the code above?
• Guidance on developing single page themes, going forward?
• What page template hierarchy should I put my code?

My Pages look like this

Thank you in advance.

‘Ace’