You can do this in WordPress, but unless your main priority is putting out timely information on a frequent schedule, go with something else. WordPress is/was/will be designed for bloggers or user who have material that they post frequently and need to have in some form of chronological order.
Fighting against the core features and usage of the program will cause you no end of grief and making compromises that you may not want to make. It can be done, I did it, but it is a hard road to hoe.
For a static page oriented site, try something - anything - else. For handling amazing amounts of information that comes in and out and is topical, then give WordPress a try. It takes about 5 - 20 minutes to install, realistically, and little or no knowledge of PHP to give it a whack, but it will require a lot more HTML, XHTML, PHP, CSS and other web design knowledge to make it do what you want it to do.