How do I get people to sign up for a Newsletter

Could you help me to make a template for people to register for the Newsletter of our Civil Association, so that they receive information that we are doing 100% with Hype ... proto I will share with you how it is going.
It is an app for children with intellectual disabilities, such as infantile cerebral palsy, Down syndrome and autism.
Any advice and support will be welcomed and greatly appreciated.
Welcome everyone.