In ArcMap 10.3 I am looking to set the default style for my labels as white with a black halo for any newly added or created layer. Is this possible? I am getting tired of altering each one as they are brought in or created. I have worked with the "labeling" tool but still have to change any incoming layer to the halo style I need.
I don't think you can set a default for new layers, but you can save styles and use them again later on other layers.
Open the Symbol Selector dialog (see help), click Save As, and give your style a name and optionally, some tags. Then you can select this style on your new layer.