Help with Categories Page in Wordpress

Good morning, with difficulties to accomplish something very simple. I want to create custom category pages for a wordpress site. I created a file inside the folder of my theme "category.php" and open the php tag to get the header and footer to start creating the links to get the posts of a certain category, however "get_header () and get_footer () "does not return anything to my page. And I'm just getting access to the page puts her full URL address type: link . Please if anyone can give me a light I am very grateful.