The Details are important _ Pay special attention to the details. They affect your readers very much. Details like alignment of the texts and the number of lines which your paragraphs include, can make readers bored or can interest them. 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.
Groups and forums _ Although not as organized and pretty_looking as standard websites, these forums contain a lot of information and useful downloads as shared by their members. Most of these information and downloads are only available for those who sign up, so joining a group or two will be very helpful indeed. Not only that, but the social aspects of these groups or forums allow you to communicate with other members. You can also choose to search for certain groups or members with similar interests as yours.