Custom post types & Thumbnails

I am looking to set up 2 custom post types - Publicity Management

What I would like to do is display the featured thumbnail for each post from the custom post type on the Publicity page. These will then link though to each post using a custom template.

I would like to do the exact same for the Management section. I have created the post type, but when I click on the thumbnails I am being taken to a page that doesn't contain any of the relevant info.

I am using a child theme of Twenty Twelve.

Can someone please help with this?

Code used for cpt registration

add_action('init', 'publicity_register');  

function publicity_register() {    
  $labels = array(
    //the (probably plural) name for our new post type
    'name' = _x('Publicity', 'post type general name'),
    //how you’d refer to this in the singular (such as ‘Add new ****’) 
    'singular_name' = _x('Publicity', 'post type singular name'),
    'add_new' = _x('Add New', 'publicity'),
    'add_new_item' = __('Add New Publicity Artist'),
    'edit_item' = __('Edit Publicity Artist'),
    'new_item' = __('New Publicity Artist '),
    'view_item' = __('View Publicity Artist'),
    'search_items' = __('Search Publicity'),
    'not_found' =  __('Nothing found'),
    'not_found_in_trash' = __('Nothing found in Trash'),
    'parent_item_colon' = ''
  );
  $args = array(    
    'labels' = $labels,      
    'public' = true,    
    'show_ui' = true,    
    'capability_type' = 'post',    
    'hierarchical' = false,    
    'rewrite' = true,    
    'supports' = array('title', 'editor', 'thumbnail'),
    'has_archive' = true,
  );
  register_post_type( 'publicity' , $args );    
}

Code used for loop

$args = array( 'post_type' = 'publicity', 'posts_per_page' = 20 );
$loop = new WP_Query( $args );
while ( $loop-have_posts() ) : $loop-the_post();
  echo 'div class=col-md-3 portfolio-item';
  echo 'a href=' . get_permalink() . ' title=' . get_the_title() . '';
  echo get_the_post_thumbnail() . ' /a';
  echo 'div class=artist-namea href=' . get_permalink() . ''; 
  echo ' title=' . get_the_title() . '' . get_the_title() . '/a/div';
  echo '/div';
endwhile;
?