Thanks popper, you seem to have covered most of it there. What i found easiest was to set up the box with screen/kbd/mouse attached initially. Once you've got past the initial setup, installed to harddisk and the nas box has an IP address then you can restart without the bits attached and manage it from a browser.
1> get iso
2> prepare box
3>boot from cd and run installation to HD.
4>set up local parameters and initialise hard disk<s>
5>get IP via DHCP (or can set fixed IP.)
6>power down, remove kbd etc, reboot
7>attempt to connect from browser with
http://whatever.ip.you.set
http://www.howtoforge.com/network_at...e_with_freenas