Reformat old iMac and restore files on new iMac

I have an early 2008 iMac which I am about to sell and replace with a newer version. I regularly use Time Machine to do back ups. What's the best way to reformat my old machine before I sell and also restore all my files onto the new iMac?

There are a number of articles available on how to prepare a Mac for sales. Here are a couple:
Prepare a Mac For Sale
Preparing your Mac for sale

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    Since you don't really have a question, I will give you a very broad information source for the next time you have a Time Machine question.
    Please visit Pondini's Time Machine FAQ for help with all things Time Machine.
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    Apple isn't here. This is a user to user forum.
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    that must be really annoying !!
    so this is what you call
    FIND MY IPHONE ACTIVATION LOCK Find My iPhone Activation Lock - Apple Support
    when you start using iCloud on any iOS device and enable find my iPhone, this prevents  a new user from using it, and also prevents anyone from using the phone
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    the only way around this is to have the previous owner reset their apple id by going to  @ applied.apple.com
    if they are unable to do this, then the only other way around this is to have the previous owner get  a copy of their original receipt and call apple support who can then lift this lock if they get a copy of the receipt
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    What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support

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