At this point you will need to connect your iPAQ to some kind of network, be it Ethernet, Wireless or USBnet - the installation process needs to download packages from the Internet. If you are using a PCMCIA card for network access, it should ideally be a card that is supported by the standard PCMCIA drivers as they are included in the initrd. However, cardmgr is not running as a daemon after the initrd boots, so you will need to insert the card before booting the initrd, or if you insert it after booting, you will need to run cardmgr manually (the command cardmgr -o will do this). Once the card's driver is loaded, you can use standard tools such as ifconfig to configure the interface, although ideally you should install a DHCP server on a seperate machine to configure the iPAQ's network connection automatically.
If your chosen method of connecting it to the internet isn't supported by the initrd (ie it doesn't work), let us know, we will try to help get it working.
While is is entirely possible to run the following commands/files via the terminal/keyboard onscreen, it is considerably easier to use a serial cable if you have one (the serial console is set to run as 115200 8N1 with no flow control).
Run the command intimate-install - the script will mount your Intimate partition and begin downloading the base packages. It will then attempt to perform some minor configuration tasks on the partition and then go into a second stage install which downloads useful packages like an X server from the Intimate feed.
When the install has completed, reboot your iPAQ, again selecting the HDD bootldr option. This time, instead of booting to the X/terminal/keyboard setup you saw previously, Intimate should boot to an X server and run a window manager and terminal.
You should now have Intimate completely installed and, as far as this document is concerned, you are on your own. At this point, you can install applications, tools, etc. as you would on any Debian machine - usually with apt-get. The Intimate mailing list (see http://intimate.handhelds.org) and/or IRC channel can help you progress from here.