SQL & PL/SQL :: Create A Select Procedure With Parameter?

I have a query like this:

*************************
SELECT vendor_id, summary_flag
FROM ap_suppliers
WHERE vendor_id = :param; --'4551'

The Results:

************
VENDOR_ID SUMMARY_FLAG
-----------------------
4551 N

Then I create the procedure:

*****************************
CREATE OR REPLACE PROCEDURE myproc4 (
p_vendor_id IN ap_suppliers.vendor_id,
p_summary_flag OUT ap_suppliers.summary_flag
)
AS
BEGIN

[code]....

Warning: compiled but with compilation errors.

I want to create a procedure that call vendor_id (parameter) and the output like the this:

VENDOR_ID SUMMARY_FLAG
-----------------------
4551 N