There are so many templates. You can write a simple letter. Or make a proposal for your work. The graphics are great and so easy to insert. With options like text boxes and the ability to add photos, everyone can turn out professional looking documents using Microsoft Word templates.
Try not to make your paragraphs longer than 3 or 4 lines. When your paragraphs are short, people will read them easily. But if they are long, it will seem overwhelming to people. The colors you use in your newsletter design is important as well. So you should know a little about colors psychology. It's not hard. You must already know about the effect of every color on people, before designing or choosing your newsletter template.