If you have many orders, either of the write one-at-a-time variety such as medications or of several different types, it's probably easiest to build an order set first and pull that into the template order list.
Order sets have the additional advantage of being saved, even if you don't add them to the template. This means you can go back to them again and again, pulling the set in to one or more templates, without rewriting the orders.
To build an order set, you must close the template you created and return to the definer.