Uploading Businesses

could you explain or give me an example of this?

Create and configure your Custom Post Type

Prerequisites
Create your Custom Post Type (or use the built in places CPT).
Add all the Custom Fields you need for your CPT.
Add a test listing to make sure all your Custom Fields look and behave as expected.
Make any necessary changes to the Custom Fields, including re-ordering the fields.

and is this saying I need to make Categories before Importing?

Create Categories

Categories are required. Each category requires the Name, slug, and a map icon. Any category referenced in your import must first be created (completely) in your site under the Custom Post Type that you want to use. See the Categories doc for more info.

If I use the Sample CSV as a template.. what adjustments do I need to make so it’s a smooth transition to import into my site.