Custom fields created with ACF to done automatically appear on the front end for posts they are attached to. You need to add code to the template files in order to show the fields.
In your case you should create a new template file names single-casestudies.php. This template will show each of the posts in your custom post type. You can start by copying the file single.php and then edit it.
The next step is to add php code to get and display your custom values. Form more information you can start with the_field() and look at other documents depending on what you need to do.
