Best material to line a steel C section garage?

Hi Guys, ive got a double garage which is just colorbond clad with a galvinised steel C section frame, its quite light material but appears to have plenty of strength.

I want to clad the internal walls, I was thinking gyprock, just screwing into the C section steel. Is there anything else that would be good to use? Gyprock seems the cheapest.

There currently is silver foil under the roof sheets but nothing on the walls, do I first need to put a blue/silver sided foil before I put insulation behind the gyprock?

It gets incredibly hot in the garage, so anything to reduce the heat would be good.

See photo

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