I'm including this here just because somebody is curious: First, look under Network Connections --> Properties for your wireless network. Ensure that File and Printer Sharing for Microsoft Networks is enabled. This must be true for the 'office' machine as well as those connecting to it.
To start files flying around your network, open My Documents. Next, move any directory (to which you wish to provide access) into Shared Files under Other Places. You can rip a musical CD, put it under Shared Music and access it from any computer in the house.
You should also find access to My Network Places in the same area. You should have access to network resources. When in the garden with your notebook, try printing off a document on the printer in the office! So, start exploring there too.
It all sounds so exciting. I want more computer equipment too!