Is this a trick question ? ;-) There is no cable car to Mont Blanc. That is another 5-8 hours of mountaineering from the top of the Aiguille du Midi cable car.
To go to the top of the Aiguille du Mid, the current hours of operation and prices can always be found on the Compagnie du Mont Blanc website, where you can reserve and pay online (it is strongly recommended to do this in July and August especially to avoid long waits at the ticket desks). You can buy your tickets from ANY lift station in Chamonix (ie the pass can be purchased for example at the Montenvers train station or Flegere lift station a day or two before, and this will also save you time if you are not able to purchase online).
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