My favorite (free) step by step guide including source code is by Steve Maill at Genisis V.
Does the group have an e-mail address? If so, use it. If you can send to the group with an e-mail address from any other basic SMTP e-mail client, then the address should be usable for SNDDST.
If not, then you can create (and maintain) a “distribution list”. See command WRKDSTL.