You should simply need an appropriate dynamic_sidebar() call in your template.
https://developer.wordpress.org/reference/functions/dynamic_sidebar/
You pass the ID of the sidebar you registered it with using register_sidebar.
https://developer.wordpress.org/reference/functions/register_sidebar/
You may wish to use some logic to see if the sidebar is active first.
$has_sidebar_one = is_active_sidebar( 'first-sidebar-id' );
And later in the appropriate area you want to render the sidebar..
<?php if ( $has_sidebar_1 ) : ?>
<div class="my_sidebar_element">
<?php dynamic_sidebar( 'first-sidebar-id' ); ?>
</div>
<?php endif; ?>
Hope that helps.