In order to write standard operating procedures you need to understand the task at hand and have at least one operator or technical person who can describe the procedure step by step. If the task is how to operate a certain piece of machinery, then the writing of the procedure must be done with input from the manufacturer. Also remember for simpler procedures or tasks it may be more convenient to write a One point lesson

The basic contents of a standard operating procedure should include :

-Name of the business
-Area of the business where the task is carried out
-A list of Personal Protective equipment (PPE) needed to be worn
-An introduction to the task
-The procedure explained step by step
-An area for notes or any adjustments made to the SOP

An example of a procedure with these characteristics can be here: standard operating procedure template