iMac restore help

It has come time for me to restore the operating system on my iMac (OS 9) I put the Restore CD that came with my iMac into the drive and run the restore application. I only have one drive to choose from "Macintosh HD" I want to do an erase and restore, but it tells me that I can not restore the start up drive. I can't seem to find any instructions with the CD. I have tried booting with the CD in the drive, but it doesn't want to load on startup from the CD. I have tried Command + S, and Control + S to see if I could find any startup options, but I'm not getting anywhere. Any help would be greatly appreciated.

Thanks,

Blair.

reboot your mac. When it begins to start up, press and hold the "C" button, which will boot from the CD WHILE IT IS IN THE DRIVE.

Just curious, why do you need to "restore" the system?
Having problems?

Yes, why would you need to "restore" the system?
From all my years of experience with Macs I have found that a "restore" is more often than not a completely unnecessary thing.