For that render specifically he most likely just used the scenes own lights which are actually pretty good, probably uses hdri's for the environment too. As for post work, no idea, but I've been doing canvases lately which lets me change the lighting really well in Photoshop.
ISO would be under render settings on the tone mapping tab.
If you don't know canvases the youtube video in
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post explains it really well.
Here's the link directly to the
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but the thread might have something else useful.