How can I completely erase everything and re install lion for a fresh iMac?

Ok so i have this iMac, and now I mostly use my macbook pro.
So what I want to do to this one is delete everything (ofcourse I will back up what I need)
and then reinstall Lion, so first it can be faster. and second ima run bootcamp on it so i can
play some PC Games.
thanks! also check out my youtube channel youtube.com/naniXgaming lol

Restart from Lion's recovery partition by holding down the Option key at startup and tabbing to it, use it to erase the internal drive, and install a new OS.
(64615)

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