How do i wipe my hard drive and install Mountain lion

OK i wanted to install mavrick but i got my macbook pro in june of 2007 so it's to old. The command R does nothing when i reboot, and everything i find online about clearing my hard drive and getting ready to install mountain lion has that step in it. So how do i clear my hard drive so my computer is brand new like the day i bought it and also update my OS from snow leapard. Do i need to buy the disk for mountain lion or can i just download it? if someone has a link to something helpful i would love to have it.. Thanks

If you can't run Mavericks, you can't run Mountain Lion because they have the same hardware requirements.
Check that your computer is compatible with Mountain Lion/Mavericks.
To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
MacBook Pro (Mid/Late 2007 or newer) model number 3,1 or higher
Your Mac needs:
OS X v10.6.8 or OS X Lion already installed
2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)
8 GB or more of available space
If your computer isn’t compatible, you might be able to upgrade to Lion.      
Computer Compatibility - Lion                       Lion
Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.      
Application Compatibility
Applications Compatibility (2)

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    Message was edited by: EZ Jim

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