For example, Id like one scree for productivity, one for music, one for utilities and a forth.
I did it using Buzz Launcher and Zooper Widget Pro. I don't really see what else you need other than that.
I have only one screen right now but when I first got the S4 I had like 6 just like your talking about. I really love Animated Photo Frame Widget for your gallery screen, totally worth it.
Multipicture Live Wallpaper is a cool app if you would like to have changing wallpapers customizable on each different screen.
There's tons of Launcher selections out there, play with them all. I think I liked Simple Calendar for a date screen, I think I used Wizz Widget for Facebook? Not sure.
We'll there's some info you can go play with anyway.