Adjust it to
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
configure network with dhclient -v eth0 [eth0 might differ based on type of connection]
ip a gives you network connections.
Update sources.list with
deb http://deb.debian.org/debian buster main contrib non-freedeb http://deb.debian.org/debian buster-updates main contrib non-freedeb http://security.debian.org/buster-security/ buster/updates maindeb http://ftp.debian.org/debian buster-backports main contrib non-free