pacman -Syu xorg sddm plasma-desktop # minimal
pacman -Syu konsole dolphin firefox # basic utility
systemctl enable sddm.service #auto start windows manager
# considering the following packages
plasma-nm #for Network Manager
plasma-pa #for pulseaudio
kscreen # screen configuration i.e. resolution
kinfocenter # device center, consider add plasma-disks
sddm-kcm # configration module GUI
powerdevil # power Management
bluedevil # bluetooth
kwalletmanager # GUI setting for kwallet
breeze-gtk kde-gtk-config # uniform GTK and Qt look