Hi @ashleypeterson,
There are two ways to have a sidebar on a page, one would be modifying the codes of the theme,
a second far more easy option, if it fits your needs, would be to add Weebly's free call-out-box element.
Dropping it inside a column and thus creating a sidebar.
Links:
App: Weebly Call out box
Demo: Example site
Hope this can help you out.
