How do I fix flashing question-mark-file-icon issue on reboot?

My Mac Book Air 11" has been a bit strange recently, so I decided that a full clean would be a good idea. I had no important files I wanted to keep, so i went ahead and reinstalled the OS. Apparently that doesn't delete everything, so I did some research. Apparently I have to delete the drive. So I did, using the command-r method. I erased my HD and made a new one, but upon reboot I get this flashing-question-mark-file icon. How do I fix this?

After you erased the drive, did you install the OSX?
Ciao

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