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How much energy is this photon/photon collier going to take? If a future experiment works, could we use this created matter to turn around and use it as energy? Or would that not be possible (i.e. - The energy used is far greater than the energy gained)

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No, the energy gained will be equal or (most likely) less than the energy used. This is because we have conservation of energy, so a process like

energy (the original photons) -> matter (electron/positron) -> energy

can not produce more energy than was put in.

In cases like this energy is not really what you want to talk about as that's always constant it's USEFUL ENERGY which is interesting.

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