A trick to writing fresh content on a consistent basis month in and month out is to learn to look at your topic from all angles and all levels. This is beneficial for your readers, because you are creating a library of information that covers your topic inside and out. This is also beneficial SEO_wise, because you are systematically creating a collection of resources that covers your subject backwards and forwards. This creates a greater chance of your article turning up for searches on every aspect of your niche. Last but not least__learning to cover your topic from all angles and all levels of depth is beneficial for YOU, because it forces you to establish your expertise in your field. If you are not already an expert in your field when you start writing articles, you surely will be after a year of consistently writing articles on every conceivable angle of your topic each month.
The other design factor aside from the text is the imagery that you can use. Many of the newsletter templates will come equipped with basic clip art or graphics. Others will include areas where you can paste in your own graphs, photographs, or other graphic items that help round out the information. It's important to remember that the first thing that people often look at, even before the headlines, are the images, so make sure that they are strong ones that are eye_catching. Color newsletters also tend to be more appealing than those in black and white, though they can cost a bit more to print.