iBook G3 Tiger need to reset to factory default
I purchased my computer a few months ago from ebay, and got (what I thought) was a great deal. This is my first Apple computer ever. It's a great starterto the Apple system. I'm selling it now and upgrading to a larger memory and better OS. Now, I'm learning that the seller should have included the OS X discs, he/she did not. I've tried contacting the seller numerous times reguarding the discs and they've never responded. =( Although, this is partially my fault because I didn't fully investigate what is needed in the event of resetting the system. (I'm use to Windows) So, I'm stuck trying to figure out how to restore to factory settings without the discs. I have checked ebay for listings and no luck. How do I go about removing my personal data and advising my potential buyer of this? Any suggestions would be greatly appreciated.
iBook, Mac OS X (10.4.11)