this board isn't a place to ask people to make web applications for you. it is a place for people with coding issues to get help.
sounds like you dont know php, and a content management system is a failry involved process. maybe you should do a google and see if you can find an open source free cms. there are plenty around, maybe you'll find one that suites your needs.
other than that, if you want to make a start on it and when you run into a problem were always here to help.