How to make clients have their own storage on windows server 2012 R2?

Hey

So I have a server running Windows Server 2012 R2, I got 5 clients connected to it.

On the server I have a second volume of 4TB which is made for client storage. So I'll like it if every Client got his own storage of let's say 500GB on this volume. Now a maybe this is a more difficult extra question:

So let's say I finished the first question, every client got his own storage of 500 gb on the server(which I don't know how to do it), now I like to have the Documents, Pictures, Videos, etc. etc. "automaticly" stored on the server instead of the local space of the client. I actually like the whole local storage of the client to be disabled and the whole "music, documents, pictures, videos" thing to be saved on the server. How in do I make that possible:P?

I hope I made myself clear and i'll really appreciate it if you can help me out I've been looking like the whole internet for this.

Thanks in advance,

Marc.