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Carol,

Sorry for lack of quote, haven’t seen how to do that yet in groups.io

There are two ways: select the text you wish to quote before clicking Reply, or click the "Quote Whole Post" button after clicking Reply.
/g/GroupManagersForum/wiki/Message-composition-tips-and-tricks

I am confused on what the members expect to see.

After everything has been copied each will receive a welcome notice from Groups.io. It includes a link to the group's site and an opt-out in case they don't want to be in the new group.

If you set up a "Welcome" notice on the Member Notices tab of your group's Settings page they will receive that also.

Is there a wiki I am missing?

There's GMF's. It isn't comprehensive but we are trying to supplement what's available on the official help page.
/g/GroupManagersForum/wiki
/static/help

Shal