Newsletter

Overview

The next 2 sources explain very well why and how you should have a Newsletter

• 
  Why you should have a Newsletter
• Email Marketing 101: How To Actually Use Your Mailing List

Outside of that I recommend Sender.net as a newsletter service as they have a free tier that allows up to 2500 subscribers and 15 000 mails a month which is pretty good.
For domains I use Porkbun but you can find more on that on my Website section.

You will need to actually have an active website on your domain to use sender because they need to verify your account first by checking your domain.
So you'll need to setup your website before you can setup your newsletter generally.