[Zope] RV: what's the best way to do this?

Hi list, I am very new to Zope and I have been observing the list for quite some time and I really like it: thanks for it to everyone! it rocks! now the question: I have been given a task to solve: create an Intranet with it, with different permissions, differente sections and different products in it, (Articles, news_items, documents, forum, calendar to name a few). Which is the best way to do this? I have been told cmf_site would be a good solution, or maybe a catalog too...but I am note sure and I seek for help. anyone can help? thanks a lot Luca