Because newsletter templates are available in all variety of lengths and sizes, there is really no limit to the content that you could potentially write. Keep in mind, however, that you should probably keep down your word count to a level that people are comfortable reading. While you may think everything that you are spouting off is fascinating, it's helpful to first sit down and make an outline of what you want your main message to be, or what the major news is that you are trying to share.
Working from this generally outline, you can then break down the overall content into smaller articles that are easily digestible by readers. These can then fit into the various boxes and subheadings of the newsletter templates, for an attractive visual layout. It's recommended to break this information down into even smaller bits and pieces, including the use of bullet points and smaller boxes of facts and figures. Graphical information is helpful for business newsletters or the illustration of sales figures. These are just a few of the ways to show your message in an appealing way, which is helped along with the use of the templates.