I'll use the density of water here, ~ 1 g/ml. 125mg is 0.125g. This is 0.125 millilitres.
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It depends on what liquid is 12.5 milliliters. 1 milliliter of water is equal to 1 gram. That makes 12.5 millilters of water equal to 12,500 milligrams or just 12.5 grams.
This cannot be sensibly answered. Milliliters is a measure of volume, mg is a measure of weight or mass.
It depends on what you are measuring. ml is a measurement of volume whereas mg is a measurement of weight.