How to create a blog index page

If you are looking for blog posts listing page, then follow the next steps:

Create a regular WordPress page and name it "Blog".
Open the page in front-end and activate the Live Composer. Place a "Blog module" on the page.

Do you need a blog listing layout on your home page?

Follow the same steps, except you need to set the new page on WP Admin > Settings > Reading > Front page.