You can use the newsletter for selling advertisement space, but again, use sparingly. Finally, you can use your list to learn more about your customers and site visitors. You can ask the people on your list to fill out an online survey, but be sure to offer them an incentive for their time.
If you don't know any programming or HTML but want to send out a regular newsletter, you can use Aweber to create text-only messages. If you want to email list send out professional HTML email newsletters, then either learn HTML and design (which is obviously time-consuming, but certainly possible), or hire a Web firm to do it for you. I would also suggest hiring a firm to help you with writing the content as well if you're not comfortable with writing. But as you can see.
you don't need much to get an email newsletter going. If you can regularly create quality content, just sign up for an online service like Aweber and away you go. An internal customer email list is a very valuable asset for any organization. Handle it with loving care. Never sell or rent your list to anyone, try to offer value in your writing, and don't overuse it as an advertisement medium.