Hi Pratik,
If you want to retrieve employee information by using GetEmployee() function. Then you have to pass Id as input parameter.
For Example: GetEmployee(employeId).Employee.Name
But You are saying, I m using CreateEmployee Entity action..
CreateEmpolyee is used to create a new employee. So, you have to pass employee information as a source and there would be Id parameter too. Just Pass NullIdentifier(). It would create new record in Employee entity.
Thanks