I don’t think its a plugin type of thing you are looking for. What you really want to do is change the homepage template to include another column.
You should start looking into creating your own child theme and check out some tutorials for customizing the WordPress templates.
If that is all a bit more than you’re willing or able for right now…. then I would suggest using a good theme …. I’d recommend somewhere like https://www.themezilla.com/, where the themes are relatively new (as is the site) and will be well supported.
If WordPress is going to be something you will be getting into tho I would strongly recommend getting your head around child themes, WordPress templates, html, css and a little php….