Creating product or stock for which there is no inventory


Sorry but new to Sage and am slightly lost.. (more than slightly). I will initially be invoicing for 2 products which I would like to add as product under a code but there is no "stock" as the product is a service. I tried to enter and added a code then was playing around in invoice templates to see if I could run and pull through the product and it is there but the invoice does not pull through the description, only the code. In essence i have 2 questions -

1: can I enter a product for which there will never be an inventory/stock?

2: how do I create an invoice which will list the description of said product rather than just the product code which will not make any sense to the customer?