I am working on a website here: http://jordanvalentin.com/testing.php
All of the pages are just plain php that are connected to WordPress to pull the posts and content of pages.
When on the main page, when you click the post title it goes to the single.php of the WordPress theme installed.
How do I go about creating a custom single.php that is styled similarly to my other pages? Is it as easy as editing the single.php of the current theme? Or is it best practice to create my own entire theme rather than just connecting WP to certain pages?