Need help with widgetizing a theme

Hey ,

I need your help to add a sidebar to my wordpress theme , I added this code to my functions.php and I see the new widget area in my widget menu screen but I cant see the widget working in the front end of my website .

register_sidebar(array(
		'name'=> 'Left Sidebar',
		'id' => 'left_sidebar',
		'before_widget' => '<li id="%1$s" class="widget %2$s">',
		'after_widget' => '',
		'before_title' => '<h3>',
		'after_title' => '</h3>',

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