0. Login as root on Gnome to do these things:
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1. Configure your network? Applications -> System Tools -> Networking Settings
2. Dunno
3 & 4. Yes, Vida Linux does use the "Porthole Portage Fronted" (emerge), go to Applications -> System Tools -> Porthole Portage Fronted.
(=Before you install any application click on "SYNC", or you'll mess up your system), now you can search things like kde (you also could type in your terminal: emerge --sync, and to install kde: emerge kde)
It will take a while to install it because your system has to compile every package. But after the installation you'll get a fully optimized program
-Good luck, I'm using Vida Linux for the first time today