Create Wireless Domain?

I searched the posts and didn't see this question, so I apologize if it has
been asked already.

I have an office building with three rooms spread out and not next to each
other. I want to create network for the pcs. I will load windows server
(SBS server 2000) and create a domain controller. Can I wirelessly create a
domain and add pcs? Set a router on domain controller and then add pcs with
wireless usb devices and a couple access points?

Do I need to string wire throughout the place (which would be a pain).

Thanks,

Tony