Unfortunately we do not have automated integrations with manufacturers at the moment, please accept my apologies about this. You would need to load the products manually at the moment.
We do plan to add an option to import products, but I do not have a specific release date yet. I have just added your name to the notification list, and I will be sure to let you know as soon as it becomes available!
Related questions:
> Do i have to manually add products to my site?