Properly Disconnect my MacBook

Hello,
I recently bought a MacBook which I connect most of the time I use it to my external 27 inch monitor.
I use a mini-display to DVI for this.
But my question, is there a proper way to do this? Like should I first close my MacBook and then unplug my mini-display cable?
Or should I first turn my display off, and than unplug the mini-display cable? Or should I keep my monitor on and turn that off at last?
And what about when starting up, should I first start my macbook, and when it's on and logged in connect my monitor?
Or doesnt it matter in what order you do things? Since I don't want to harm the MacBook without knowing.
(p.s. I did some research on google but found very different reactions from people)
Thanks,
Mark

Anyone?

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