Apple?

Hi, I've just reset my iMac using the cmd and R keys. I then went into disk service and had to delete things there, then reinstall it. It took an hour, and then it asked me if I wanted to set up my WiFi. Is the iMac ready for sale now? I'm not connecting to my WiFi now, otherwise my stuff would be on it again, but is the start of the iMac like if I'd bought a new one, or should I be worried that as soon as the person connects to the WiFi there would still be my stuff on it?