Print line in Spool file...

I'm trying to write a batch file to execute some sql in sqlplus that will generate a flat file. I would like to be able to insert a couple of lines of text at the beginning of the file but am having a problem finding the correct way to do it, can someone help?

I'm trying to use dbms_output.put_line but fear I'm using it incorrectly...

 My sql script...

set feedback off
set verify off
set head off
set echo off
set linesize 30
set pages 0
set serveroutput on

spool W:\scripts\Wk1.csv

dbms_output.put_line('test');

SELECT * from table 1;

spool off
quit