How do I use UTL_FILE to insert a large number of fields to a file?

Hi
I am trying to use UTL_FILE for the first time in a Stored Procedure. I need to run a complex query to select 50 fields from various tables. I need these to be inserted into one line in the output file for all rows. Is this possible? My procedure so far is like the following
CREATE OR REPLACE PROCEDURE PROC_TEST IS
output_file UTL_FILE.FILE_TYPE;
BEGIN
FOR query in (SELECT FIELD1, FIELD2, ..........FIELD50)
FROM TABLE A, TABLE B
WHERE A.ID = B.ID
ETC
LOOP
UTL_FILE.PUT_LINE(output_file, <put all 50 fields for all records into file> );
END LOOP;
UTL_FILE.FCLOSE (output_file);
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
WHEN OTHERS THEN
UTL_FILE.FCLOSE_ALL;
RAISE;
END PROC_TEST;
Do I need to define 'query' (after the FOR) anywhere, also please advise with how I put all of the fields into the file.
Thanks
GB

Thanks Steve,
I have the UTL_FILE working fine now.
I have other queries to run and conditions to apply in the same procedure, and I need to schedule via Enterprise Manager, therefore using UTL_FILE in a procedure seemed the best option. I looked up Data-pump but this seems to be an 11g feature, and we are still on 10g therefore I will not be able to use it.
Thanks for your help.
GB

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