Try the following:
- Right click on this link and save the XML full of dummy content provided by WordPress
- In the sample data, you can remove the unwanted data such as pages, comments, categories, etc.
- Go to Tools > Import in the admin panel
- Install the “WordPress” importer from the list
- Activate & Run Importer
- Upload the XML file
- Map the authors in this export file to users of your choosing
- WordPress will then import each of the posts
If this doesn’t satisfy, I’d recommend looking into plugins that generate dummy content to your expectations