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<?php 
 //this would go into my funcitons.php
  register_sidebar( array(
		'name'          => __( 'Footer Signup Form', 'themename' ),
		'id'            => 'footer-signup',
		'description'   => __( 'Add widgets here to appear in your sidebar.', 'themename' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget'  => '</aside>',
		'before_title'  => '<h2 class="footer-signup">',
		'after_title'   => '</h2>',
	) );
?>
<?php 
  /**
    This would go in my custom page.
    If my page was named Custom, I'd place this in page-custom.php
    If this was a custom pust type that had a slug of custom, I'd place this in single-custom.php
  **/
?>
<?php if ( is_active_sidebar( 'footer-signup' ) ) : ?>
	<div class="footer">
		<?php dynamic_sidebar( 'footer-signup' ); ?>
	</div>
<?php endif; ?>