You don’t want to have a blank community when your fans join for the first time, so It’s best to have at least one post in the Home Feed and one post in the Discussions.
First Home Feed post - this can be simple, just thank your fans for joining and ask them to introduce themselves in the comments below. You can make a video or just a text/picture post. Keep it simple and thank them, set the tone, and get them involved.
First Discussion Posts can be:
Ask what type of content they want to see from you in your community
Ask people how they found out about you and became a fan
Ask people if they have a favorite memory involving your music whether it was a show or discovery a song or whatever