update

pkg update
pkg upgrade

su rights for user

pw groupmod wheel -m [user]

install

pkg install xorg gdm gnome3 nano htop mtr firefox

Xorg config

pkg install xf86-video-intel
Xorg -configure
mv xorg.conf.new /etc/X11/xorg.conf

add the following to /etc/rc.conf

gnome_enable="YES"
moused_enable="YES"
dbus_enable="YES"
hald_enable="YES"
gdm_enable="YES"

finally reboot