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Do I need a mini DVI to VGA?

It depends. Does your MacBook have the Mini DisplayPort or the MiniDVI Port?

You'll need the MiniDVI to VGA if you have the MiniDVI port. It can be found at http://store.apple.com/us/product/M9320G/A?mco=NDY5Nzk0Ng

You'll need the Mini DisplayPort to VGA if you have the Mini DisplayPort. It can be found at http://store.apple.com/us/product/MB572Z/A?mco=NDcwNjQ3MA

As jessica mentioned, http://www.monoprice.com is a good place to find these on the cheap.
 
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