Try this:
http://wiki.modxcms.com/index.php/Basic_Blog
This is basically what you want to do.
Newspublisher is to create documents.
Ditto will display your documents (your brief news item with the "read more" link to the document.)
The documents created by Newspublisher will show up in the document tree. You should tell it what parent under which you would like them to appear.
You will then tell Ditto to look in that dir (or dirs) for documents and display them.
You use the ditto templates to customize the look of your news display. (Use the link that Ryan left you to find out how to do that.)
Hope this helps.
For a completed example (live) you can look at
http://www.nqnh.ca the news items on the left are using this exact method.
Cheers,
Jay