Reselect your vertical path, focus on the Appearance panel, make sure that the entire path is selected (simply click on the "Path" piece of text from the top of the Appearance panel) and go to Effect > Stylize > Drop Shadow. Enter the properties shown in the left window (in the following image), click OK and go again to Effect > Stylize > Drop Shadow. Enter the properties shown in the right window and click OK. Make sure that your vertical path is still selected, open the Graphic Styles panel (Window > Graphic Styles) and simply click on the New Graphic Style button to save a new graphic style. Keep focusing on the Graphic Styles panel, simply double-click on the newly saved graphic style and rename it "vPath".