You will benefit in many ways as a subscriber. Study the elements of the ezines that you receive. Such as sections, format, design, and their material. Here's a few pointers that are the basic template form. Keep lines to a 55-60 character max including spaces.
White space is an important factor to readers.
Build a trial or two then ask someones opinion. The publishers are for the most, more than willing to lend help. As a subscriber you can get aquainted with the publishers. This will provide a promotional platform for your ezine when you're ready to kick it off. You don't have to write your own articles for your ezine as you can find content for your ezine in many places on the web, but if you want to test your writing skills, offer your articles to the publishers of the ezines that you subscribe to.