'I have dsl now with a router' ???
For the wireless thing... you need a wireless card.. for all the computer you have... it available as PCI card and USB.
Google it.. Linksys, Netgear, Belkin, 3com, D-Link etc...
But just remember that you will be connected to all computer in the park.
I would get myself a Wireless Access point router, and make that as repeater, and configured using different IP address, and mac filtering.
You may need some information for this from the Wireless provider in that park.
I live in a mobile home in a mobile home park. My mobile home has metal siding. The park is installing a wireless system that covers the whole park. The people living here will be able to get online wireless, all we will need is an adapter plus the proper codes. So before I buy something for my three computers I need some advice as to what is best. I have dsl now with a router and two of my computers are hooked up with a cable and the third with a usb adapter. So I am open to all ideas as to how best to meet my needs and get the most bang for my buck.