The page you select as your posts page in "Settings->Reading" will automatically list all your blog posts chronologically beginning with the most recent one. For the blog page it is not possible to choose page template. Different blog layout options can be selected from within the Customizer.
6.1 Blog Options
In the Customizer's Blog Options panel, under Blog Layout, choose the layout best suited for your site. You can change the position of the sidebar, select a grid layout, or opt for a list layout without a sidebar. This layout applies to archive pages as well.
In the Customizer's Blog Options panel, you can choose to display post in full length or excerpt.
In the Customizer's Blog Options panel, you can hide items like post author and date.
6.2 Creating a post
Posts are entries that display in reverse order on your posts page. Posts usually have comments field beneath them and are included in your site's RSS feed.
Read more about writing a posts here: https://codex.wordpress.org/Writing_Posts