Hi, You can create a custom sidebar in Theme Options > Sidebars, then to apply some widgets to it, please go to the Appearance > Widgets and insert the widgets you want to see in this sidebar tab. http://prntscr.com/mf5he6
To asign the sidebar to the single page, edit a page you want to have it and select the side you want to have it displayed on the screen.
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You can create a custom sidebar in Theme Options > Sidebars, then to apply some widgets to it, please go to the Appearance > Widgets and insert the widgets you want to see in this sidebar tab.
http://prntscr.com/mf5he6