How do I get the comments section to show up?

if you look in the twentyTwelve theme. you can see how they get the comments. Look in the full-width.php file and you can see this code

 <?php comments_template( '', true ); ?>

this will call the code to get your comments section. Now you must make sure that your theme has the comments.php. You can also check twentyEleven and twentyTen theme to see the different methods