The site that i am looking to set up is for a new non profit support group, so the ablity to charge membership is not a priority.
The site will be a center for discussions and transfer of files to other members of the initial start up group. at this time they have minimal funding and asked me to help them set up an Intranet, I could not find much free Intranet programs, so a friend suggested I set them up with a private Bulliten board such as phpbb.
give the User Guide
a look. it will explain how to set this up.
you can also restrict access to everything , even the first page, to members only.
there is a MOD to do this once you have it installed.
if you decide to charge for memberships there is MOD to do that as well.
phpBB is completely customizeable with hundreds of MODs ( modification scripts) already developed and available for download.