Loop Help

What I am wanting to do and I’m not sure how is to include in my loop 10 excerpts on the page but I want to skip the most current 5. I know that I have to put a wp_query somewhere with a number of posts and an offset but I don’t know how to modify the current loop seen below to do that. Any help is appreciated.

<?php $theme->hook('content_before'); ?>
     <?php
         if (have_posts()) : while (have_posts()) : the_post();
               get_template_part('post', 'homepage');
            endwhile;
         else :
            get_template_part('post', 'noresults');
         endif;