Try looking in your theme’s page.php template file and adding <?php get_sidebar();?>
or amending the call to get_sidebar to use the same sidebar template as your Home page.
I have not set these up using the sidebar. The way i have done it is each of the top menu items are categories and each initial left menu item is a post.
Each of the categories uses a custom page template which i have added a php array to show the posts from that cat if that makes sense?