You may also want to use a professional proofreader, but at the very least, be sure to use spell check. It's really easy to miss errors in emails, especially ones you have personally written. Be sure to double and triple check every message that goes out. There are several ways to start your own email newsletter or mailing list. In regard to the logistics of setting up your list, you may want to consider several options.
If you want to use a free service while your email list starting off, you could implement a form on your website that obtains the subscriber's name and email and when the submit button is clicked, it will send the information to an email designated for your mailing list. Generally this option is free but it will be very time consuming to manage all the emails and keep updating an excel spreadsheet whenever you receive a new subscriber.
Most bloggers and internet marketers prefer to use an automated email newsletter or mailing list solution because it will require less maintenance and it gives you more control over the analytics and statistics of your subscriber base. The majority of bloggers, website owners and internet marketers use a service called Aweber. Keep in mind, your mailing list may become your company's greatest asset.