T-SQL (SS2K8) :: Call Stored Procedure And Obtain Specific Results

I have a few questions about the following t-sql 2008 r2 sql code listed below that is calling a stored procedure:

DECLARE@return_value int,
@endYear SMALLINT = 2014,
@CustomerID INT = '9999',
@Schedules CHAR(1) = N'C'

EXEC [dbo].[sproom] @endYear
,@CustomerID
,@Schedules

The sql listed above does execute the stored procedure called [dbo].[sproom] successfully and returns all the data all the rows from the stored procedure multiple times. However can you tell me the following:

1. How can I have the stored procedure return distinct rows?
2. I want the stored procedure to return selected columns. I tried using the OUTPUT parameter for some of the columns, but I got the error message, "Procedure or function spHomeroom has too many arguments specified.".

when I change the sql above to:

DECLARE @return_value int,
@endYear SMALLINT = 2014,
@CustomerID INT = '9999',
@Schedules CHAR(1) = N'C',
@CustName varchar(50)
EXEC [dbo].[sproom] @endYear
,@CustomerID
,@Schedules
,@CustName

That is when I get the error message.

A solution might be to change the stored procedure, but I would prefer not to since this is a generic stored procedure that I believe a lot of t-sqls and stored procedures will use.