There are basically three ways to upgrade your database:
1. upgrade from the command line (u0801060.sql)
2. upgrade using odma
3. export/import

For beginners, I recommend using odma (Migration Assistant). It is a GUI based tool that basically does everthing for you.

I would highly recommend reading [url]http://technet.oracle.com/docs/products/oracle8i/doc_library/817_doc/server.817/a86632/toc.htm[/url] throughly before you attempt an upgrade.