The Posts menu option on the left is where you add blog posts. To add a new blog post, select the Posts > Add New option from the left hand WordPress menu.
You will then be able to set a title for the blog post, add the body content, and also provide all the meta information such as extra details and media. In the blog meta you can set the image for the thumbnail, and also the media type for the detail page.
You can use the Page Builder to create the content of the item, which effectively allows you to have limitless possibilities for what you can display, and also how you can display it.
To display your blog posts, you will then need to create a page that includes the "Latest Work" page builder asset. The blog asset has the following options included, allowing you to customise the output to your liking: