Hello Britton,
The first and most important thing is to take care of the rust to prevent further damage. I'd get some fine bronze wool, wrap it on a bronze 12ga brush and with plenty of gun oil, scrub the rust away in the bores. You can also use the bronze wool and oil on the barrels without harming the blueing. What caused the spotting I don't know, possibly blood splatters. You can use any gun oil such as Break-Free CLP or similar oil to wipe on the metal.
The rest of the gun, assuming in good mechanical condition, is shootable as is. If it were mine, I'd have the barrels reblued by someone who is familiar with vintage barrel blueing. I'd leave the rest of the gun as is.
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