We imported your products from your store. You can go ahead and sync them now, or sync them as orders come in. If there are products you don't wish to fulfill through Printful, you can mark them as ignored.
If automatic fulfillment is turned on and all of the products in an order ar synced, the order will be fulfilled automatically. If some products aren't synced, the order will be saved as a draft so you can sync products on the fly.
You can manage how orders are processed in your store settings.