How Can I Connect My Pc, Mac, Poket Pc With Wi-Fi? What Is The Easyest Way To Configure The Settings?

I have bought Cisco's Linksays Wireless G Broadband Router Model No.WRT54G. I have also bought a Wireless Network Adopter. The problem is I can't connect them. I have a 3 things to connect. My broadband is working properly. I having a problem to confugure the settings. Please tell me the easyest way to do that. My work is getting hampered. Please ist me....