What is the process in designing a Workflow?

Create the objects mentioned below in the order they appear.

              Record ,
              Page ,
              Component,
              Role ,
              role Query,
              Worklist record,
             Activity, (Step,Event, Worlist)
              Business Process

How to send email to the all employers from the peoplesoft application when a certain event is true?What is the event used to trigger?

Create a workflow. In the workflow, use a query with active employess and their email ids as inputs. On the successfull occurence of the event, trigger this workflow using TriggerBusinessEvent.