[Theme Horse Support Team]

Hi Florent,

We cannot help you creating custom post type template. It needs lots of code customization. For this you need to hire a developer. Before making any changes in the code first of all create a child theme and then customize the code. So that while updating to new version your customized code will not be lost. If you are good at coding then you can visit this link how to create custom post type.
https://codex.wordpress.org/Post_Types
https://codex.wordpress.org/Function_Reference/register_post_type
http://www.wpbeginner.com/wp-tutorials/how-to-create-custom-post-types-in-wordpress/

Thank you!