Custom Category List

Found these links to be useful.

http://codex.wordpress.org/Function_Reference/wp_get_attachment_image

http://johnford.is/programmatically-pull-attachments-from-wordpress-posts/

I have the following code.

function postListEditLink($post){
	$id = 811; // ID of an attachment
    echo wp_get_attachment_link( $id, '' , false, false, 'My link text' );
 };

Which works but it is pulling that specific attachment any suggestions on how to tell it to pull the first attachment from a list of post?