Need to delete all data and restore computer to factory state !

Hi - please help. I have made a mistake - I tried to migrate data from my iMac to my brand new MacBook Pro (no idea why !) , and I have way too much data. The MacBook memory is full already. I therefore want to delete everything and restore the MacBook to its factory state. I have already deleted and reinstalled OX S thinking this would do it but it hasn't. The issue is it says the disk is full but I can't see any files or folders to delete. Where are they ? And how can I delete them all ? Please help - I am very excited about my MacBook Pro and within 24 hours its clogged up

Power off your MacBook.
Hold down the "Option" button while starting up the computer. You may let go once you see the spinning dial below the apple.
Using the arrow keys, navigate to 10.8 Recovery and press enter.
Select your language and go into Disk Utility.
Click on your hard drive (not "Macintosh HD," the one above that with the brand name, model, and capacity).
Go to the "Erase" tab.
Make sure the volume type is set to "Mac OS Extended (Journaled)," and click the "Erase" button on the bottom of the window (not "Erase Free Space," that will do nothing), and choose how secure you want the erase to be. The less secure the faster it will go. For a hard drive with a capacity of 128 GB this can take anywhere from 3 hours (least secure) to 24 hours or more (most secure).
Go through the same process you did to reinstall the operating system.
You should be good to go.

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