If you are using the Showroom you can add ordering from a linesheet to your selling tools.
Create a collection and download the PDF
Send the PDF to a customer
When you customer opens the PDF, and they click on an image, they will be taken to the Showroom Login page, from there they can browse the product in more detail and start an order.
If your customer is already in your customer list and has ordered before, they would enter their password as they would normally. If this is a customer who is not in your customer list, the system will ask that they register before hand.