So, airbrush/acryllic paint? What does it mean?

To make Leader Prime's grey plastic parts look more 'metallic', or shiny? I heard acryllic silver paint does well.
Then I hear about airbrushing. Waah? Keeping in mind I'm a novice and brushing figures (I've done 3 so far: Ratchet, Blackout and Vector Prime), I am looking for an effective technique that at the same time won't need me to take apart the whole figure.
Thanks for any advice on painting.
Then I hear about airbrushing. Waah? Keeping in mind I'm a novice and brushing figures (I've done 3 so far: Ratchet, Blackout and Vector Prime), I am looking for an effective technique that at the same time won't need me to take apart the whole figure.
Thanks for any advice on painting.