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.
It is best to take your own sweet time before arriving on a final decision relating which particular option you'd choose. In the samples section you would be able to see how your proposal would probably look like. In a majority of cases the forms in such samples would comprise space so that you can add the images and graphics of your choice. It is not only images but text or data that you desire changing or columns, all could be done. Template for proposal since easily could be found over the Web means a lot of people may be using it so if you desire, customize somewhat more the content in your offer so that it looks original in higher terms. A special care must be given to the grammar so that your creation looks flawless and impressive.