Rather than working from scratch, sometimes it's easier to duplicate an existing page and use that template for a new one. Here's how easy it is to do this.
Video Tutorial:
1. Click 'Pages'.
2. Click 'All Pages'.
3. Find the page you want to duplicate and click 'Duplicate Page'.
4. From here you can do all of the regular things that you can do in Page Builder, but you're actually in a copy of that original page.