Za thumbove mozes da definises velicine tako sto u functions.php dodas:
PHP kôd:
set_post_thumbnail_size(170, 170, true); // default Post Thumbnail dimensions
// additional sizes:
add_image_size('thumb-small', 84, 84, true);
add_image_size('thumb-list', 285, 300);
add_image_size('thumb-gallery', 200, 175, true);
i posle samo koristis te nazive (thumb-small, thumb-list,...)
A za "read more" mozes da definises u the_content() sta ce da ispise, pogledaj help za f-ju, imas ovde objasnjeno sve kako
http://codex.wordpress.org/Function_...ce/the_content