How To Declare Cursor In Stored Procedure?

I am trying to decalare the cursor in the below stored procedure. Can any one please help me to correct the cursor declaration?? Basically, i am testing how to declare the cursor in stored procedure.

CREATE PROCEDURE STP_EMPSAL
@empno int,
@Employee_Cursor CURSOR VARYING OUTPUT
FOR SELECT empno FROM AdventureworksDW.dbo.emp
AS
OPEN Employee_Cursor;
FETCH NEXT FROM Employee_Cursor into @empno;
WHILE @@FETCH_STATUS = 0
BEGIN
BEGIN TRAN
UPDATE emp set sal= sal+ 2000 where
empno = @empno and comm is null
mgr='Scott';
FETCH NEXT FROM Employee_Cursor into @empno;
COMMIT;
END;
CLOSE Employee_Cursor;
DEALLOCATE Employee_Cursor;