Log in as root, and do post-installation updates, to wit:
portsnap fetch extract update
freebsd-update fetch install
install an initial-but-minimal working system, starting with pkg(8), the packaging system itself:
pkg bootstrap
Developer’s basic toolkit (and I prefer bash for an interactive shell):
pkg install git bash gmake cmake pkgconf gettext-tools binutils
echo fdesc /dev/fd fdescfs rw 0 0 >> /etc/fstab
echo proc /proc procfs rw 0 0 >> /etc/fstab
An X Server and a backup X11 environment (ancient):
pkg install xorg xterm twm
Desktop technologies (modern):
pkg install hal dbus
echo hald_enable=YES >> /etc/rc.conf
echo dbus_enable=YES >> /etc/rc.conf
Clean up
pkg autoremove
pkg clean
rm /usr/ports/distfiles/*
Reboot again.