How to create a group and have a group chat for the same?

We are creating a football community at our organization. I would like to have a closed group and post updates on it. At the same time, i would like to have a chat with the group sometimes. Instead of creating a community group and chat group separately, Do I have a default chat group to communicate on chat box?

It’s doesn’t look good to post hi, hello for every small thing in the group. So a default chat option is feasible.

How can I create the same?