A new article on working with WordProcessingML paragraphs is ready for you on OpenXmlDeveloper.org. It takes you through the basics of working with the WordProcessingML related code snippets, which you can get here. I've kept this first article pretty basic, to show you how the code snippets work together to perform various tasks. The next article is almost complete, it is about the manner in which a table is represented in WordProcessingML. Right after than one I'll release the article about the table related code snippets.
Enjoy!