there, i've managed to make custom posts for the site.

hi there,
i've managed to make custom posts for the site. however, i'm not sure how to make a list of these posts.
if you check here: http://vantagestudio.co.uk/suppliers/red-giant/
the custom post type works fine, but when i remove /red-giant and try to go to:
http://vantagestudio.co.uk/suppliers
it shows 404. ideally, i'd like to display a list of suppliers, similar to how it works with plants on your example.

thanks,
Adam