Template for custom post type

I created a custom post type for my website using these instructions. Its slug is esercizi-meditazione and it works well.

I would like to create a specific template for this post type, but I am not very expert. As a starting point, I created a file called “single-esercizi-meditazione.php” in the child theme with this code:

<?php get_header(); ?>

<?php hu_get_content( 'tmpl/page-tmpl'); ?>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

I used page-tmpl, rather than single-tmpl, because it displays the featured image. It works, but I need to customize it further.
How can I have a template different to page-tmpl and customize it?
If I create a new template with a different name, the post is displayed like in a post list.
Thank you for your help.

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