How to create Store Procedure with multiple parameter

CREATE or ALTER  PROCEDURE test_sp @Employeename nvarchar(100)
AS
DECLARE @emp nvarchar(100)
SET @emp = (SELECT  Employeename   FROM Employees where Employeename=@Employeename)
IF @emp IS NULL
 PRINT 'RUN SP'
ELSE
 PRINT 'FOUND'
 select @emp


GO;



exec test_sp 'test1'