Search widget on custom theme

Hello guys, I am doing some work with the widgets, the search widget works great with the wordpress themes (as expected!…what?) But with mine it does nothing once the button is clicked.

So I assume that the search widget does not know where to output the search content?

I created the bare WordPress website with no content other then what is needed.

Does it create it onto a single-page.php or searchpage.php of some kind? I can’t find much online on how to get it to work.

This is the code on the homepage

<?php get_header(); ?>

	<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('header_sidebar') ) : 

endif; ?>

<?php get_footer(); ?>

Here is my functions.php

<?php function wpgyan_widgets_init() {

	register_sidebar( array(
		'name' => 'Header Sidebar',
		'id' => 'header_sidebar',
		'before_widget' => '<div>',
		'after_widget' => '</div>',
		'before_title' => '<h2 class="rounded">',
		'after_title' => '</h2>',
	) );
}
add_action( 'widgets_init', 'wpgyan_widgets_init' );

?>

this is about as far as I have gotten!

Any help would be a great help