Joomla backend expansion - repost

We are seeking improvements to our website that include the following: • A backend portal that members can access for documents and information that is secure. • The ability to set up various security levels within the back end portal, and assign access to materials based on those levels: • A secure member directory that includes: Member name, Company name, Cell Phone, Email • A section for media: video (section for our [login to view URL]), pictures (utilizing a slideshow), events • A calendar of events – external to the public,and one for the secure site • The ability to integrate a newsletter using [login to view URL] into the site (secure side) • Online store that integrates with [login to view URL], would like it to be an extension of primary dashboard • Include sharing buttons to share articles, blogs, videos, pictures and information utilizing a system such as [login to view URL] or similar platform.