|Pretty sure the older OS's are free at Apple, you can't run any powerpc versions.|
The documentation also ought to be at apple.
Might look at linux or beos for that to try. There might be some old unix versions that might be out there for that too.
It is pretty old. Might be better to use mac on stick or do the hackintosh deal.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10