I’d say, install the Blog Site skeleton separately, and take a look at how it’s set up. You then can try importing the pages in your own site. There’s nothing more than adding this folder to your site: https://github.com/getgrav/grav-skeleton-blog-site/tree/develop/pages/01.blog and the subpages, which are the blog posts.
The blog plugin provides more advanced things you might want to add later, but to start with, having a list of posts is just fine I think.