Help with mp_list_products?

Building my own mp_productlist.php and can't get this to play ball:

mp_list_products('text=none&paginate=1&per_page=6&order_by=date&order=DESC&text=none&thumbnail_size=300);

As you can see, I want no text, 6 items per-page etc... I'd also like to list tags and categories but can't see this in the guide?

Little help?