First steps after installation.

See http://www.debian.org/ports/hurd/hurd-install for configuration bits and tips and tricks.

Setup GRUB

You surely want grub to have a nice menu entry able to boot GNU, instead of typing a boring arcane. There are Debian-specific scripts that may help you. See GRUB's page for this.

Setup apt-get

Installing packages without having a network connection is described DebianAptOffline.