How do you intend to insulate the graphite? Electrically, that is. It would be a shame for your waterblock or heatspreader to short-circuit your heater.
As for how to connect it, electroplate a pair of copper or silver patches and solder leads on. To figure volts/amp/dimensions/etc you need to find out the resistivity (units of Ohms*cm, usually) of the graphite you have.
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