These links should help you:
http://codex.wordpress.org/The_Loop
http://codex.wordpress.org/Function_Reference/wp_get_nav_menu_items
with this two techniks you can give your client the ability to change the content and the navigation. For these you have to edit your theme and insert the snippets on the placese you want to output your contents….
For the footer you can use a custom page maybe footer
$loop = new WP_Query( 'pagename=footer' );
while ( $loop->have_posts() ) : $loop->the_post();
the_content();
endwhile;