For the background, find the wrapper id that encloses the right part of the page, and in your /includes/templates/your_template/stylesheet.css, edit that wrapper's rule to add

background-image: url(../images/your_image.gif);

or whatever the location/name of your image is.

The footer can be turned off by editing /includes/templates/your_template/common/tpl_main_page.php as described in the comments at its top, or you can affect its display by editing the #navSuppWrapper rule in the stylesheet. You can turn off most of the footer elements in admin.