Imac wont boot from cd, Can anyone help me Please

Hello, I just bought my first mac from a co-worker. it didnt have a hard drive so i threw a spare one i had in. I tried holding c when booting, and all i get is the little smile face and the ? on a folder. At first when i booted the computer it didnt make any sounds. Then i found that the apple key option pr resets something. So i tried that. It now plays sound when i first boot up. But still can't get into the cd. I also tried the optionapple+fO. It came up with a screen and i did the reset-nram. but it couldnt find the command reset. Im so lost here. Im hoping i didnt waste my money. Any help here would be great. But please remember that i no NOTHING about macs. So please explain what you need me to do. Thanks alot
Also let me know if you need more information

As Robert suggested, the responders here will need to know what model of iMac you have, most importantly whether it is a slot load CD, or one of the older tray load models. The tray load ones have the slide that extends. The slot loaders suck 'em in.
If the CD drive is functioning, your Mac will boot from your original install CDs, or a "Universal" OS9 (White background, Orange "9"). Once booted from the CD, open the "Utilities" folder, choose the Drive Setup utility, and initialize, or partition and initialize the drive. (Post back here if you need help on that step)
If the CD drive doesn't work, try cleaning it with one of the commercial cleaning disks. If that doesn't work, they are replacable using a takeapart like iMac takeapart - link. Replacements are available on eBay.
Remember to fold the front foot forward once you start using the iMac. 350MHZ and above have no fan and are convection cooled. The foot in the forward position allows better cooling.
Good luck, and ... take your time. These are great little machines!
David

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