How to configure Wirless Switch

I really want to know who configure Linksys by Cisco N-Dual wirless in Windows xp environment. I’ve Linksys Cisco N. I’ve one network with 9 computers share the network and a broadband connection. I plug the linksys wirless to one port of the existing switch and want to give internet access for people who has laptop outside the room. how could I do that sir. I don?t even know what to plug where.
Regards,