Thank you both, Sacred Path and Auxclass! Please correct me if I am mistaken, but since I anticipate another of our group members helping me by being given an "editor" role, it might be most feasible to take the option of remaining with WordPress.com (instead of going to WordPress.org), since neither my editor nor I, as administrator, would have to install software on our own pc's. Then I could get the forum capability by linking to a forum from one of the forum providers listed above, in Auxclass's posting near the top of this page.
I also assume that if I used WordPress.org, I'd have to ftp whatever I build to the hosting site - since in essence, the site is being built on my own pc using wordpress software from wordpress.org. I don't see how I could have another person editing from his own pc, in that case.
Am I correct here? I am not trying to drive you insane, just retain my own sanity as I consider the alternatives.
In all cases, thank you for your informed responses!
Friede sei mit dir und durch dich! - courtesy of Google Translations...