This approach tends to work better for articles that are jam packed with information and/or those that take a broad, aerial view of the topic, but it can also work with articles that are a close up view of one specific topic. For example, I've written many articles on how to create an effective resource box, and from that one very laser beamed topic I have branched off articles on extremely specific elements of that already specific topic. I assure you, no matter what your article is about, you can write about it more in depth in a new article.
The design of newsletters has become easier than ever before with the help of easy to use newsletter templates, that are available to download on a number of websites. The problem then becomes the content, and how to fit this into the template in the most interesting and eye_catching way. There are a number of different techniques that can help you work out how to get your message across in the most clear and appealing way possible. It may be helpful to work out this content in advance before choosing the template, so that you can adapt it into the design model of your choice.