New user: How to set up multi-column newspaper layout?

I’m a longtime Wordpress user trying to figure out Ghost and my biggest issue so far is I’m not seeing a way to set up a multi-column layout for an online newspaper. Essentially I’m looking for left and right sidebars, with a wider column in the middle where my main news content will go. I’m trying to use the Reporter theme by High Five Themes (see screenshot), but Ghost’s Souce (News) theme is also an example.

Install one of those themes.
In the case of source, set it to highlight or magazine mode, from /ghost > settings (gear) > design and branding> theme tab

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