Creating a log in page or client portal

Hello All,

So i have a quick question and hopefully wanted to get some input. I have a multi site install and trying to create a log in page for my multi site network, hoping this page will log them in to a "client portal" where they will have further access to the support plug in pages that is installed as well as links to log in to their wp area? Am I making sense here.

Please let me know you're thoughts.

Thank You,