Any particular reason for using 9i? It's two major versions out of date, and with a fairly new interface like OCCI that difference is significant. You can get the 11g stuff from here: http://www.oracle.com/technology/sof...ase/index.html
and the OCCI documentation is here:
(doc index here: http://www.oracle.com/technology/doc.../database.html
Make sure you install the Examples disk and have a look through the OCCI sample programs and make files; there's lots of useful stuff in there.