Where do you add a WORK.PHP post?

There are multiple players at play here.

• Make sure you have your custom post type set up...in this case it's likely called "work".
• Make sure you have your custom fields set up, and assign those fields the the CPT "work"
• Create your post and fill in your fields in the WP admin dashboard, just like you would a regular post
• Make sure you're calling the right template. Follow these steps if neeeded: http://codex.wordpress.org/Page_Templates
• Make sure you're running your post query correctly. You'll want to run a new WP_Query and if your post type name is "work", than you want to pass the argument post_type => work to the new WP_Query.
• Inside of the loop, make sure you are calling your fields correctly. The default WP functions like <?php the_title();?> and <?php the_content();?> will still work. Than depending on the custom fields you set up, and the names you give them, you will call them in your work.php template following the API that the Advance Custom Fields Docs give you. Often times you'll use something like <?php the_field( 'name-of-field' );?> to retrieve the field.

If you follow those steps, you should see your custom posts and custom fields show up on your custom template.