Can't get Wireless to work on Vaio

[MrDiaz]

Hi, just joined the forum. I've just installed 10.5.5 and it works like a charm except for a few tweaks I'm gonna have to do to make sure everything works perfectly. My computer is the following:

 

http://esupport.sony.com/CA/perl/swu-list.pl?mdl=VGN-FW160D&region_id=3

 

I'm completely new using Mac and I can't seem to find a guide to help me setup my wireless connection. I've searched the forums but everything I find has over 25 pages long and nothing too concrete. Can you guys point me in the right direction?