Add a login and sharepoint files into my web app

Hi, I have already built a webapp, im just missing users features like the ability to login and access to sharepoint files. I need someone to add that functionaity to this. Users need to be able to login and then they can add sharepoint file access saved to users accounts. they should also be able to use those files in a list to be added into the web app. Finally, we should be able to see other users logged into the system as well. You should be using mysql as we are using that too. and you should be storing peoples info using the ssl we already have on the site. Finally i need some way to manage the new users. Thanks