What is the best way to reformat my macbook and reinstall?

I run a Macbook on OS X Lion which I installed via the app store. How can I reformat my Macbook and reinstall OS X Lion without the disc? Secondly, How can I then upload my TimeMachine backup so it was the same as before?
Will this repair all disc permissions and ensure maximum performance from my computer?
Jonathan =]

You must create your Lion install disk, before.  Read here how you can:
http://hints.macworld.com/article.php?story=20110831105634716

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