Setting up an ADSL modem router with a wrielss router

Hi I have just installed a BT Voyager 205 modem router to get my broadband
working and when I got to the question in the wizard asking me how I was
going to use the 205, was it with just one PC or 2 PCs or a games console I
was stumped? I wanted to use it with a Medion MD 40900 wireless router so for
some reason I chose games console just to move on but I wish I had chosen the
2 PCs in hind sight as I think that would have sent the Broadband down the
Ethernet cable where it would have been some use in the wireless router. I
have used the USB cable from the Voyager to my PC and that works OK and that
leaves the Ethernet cable to go to the Medion. I assume that goes into the
WAN socket on the Medion wireless router and another cross over cable to go
to the PC in the LAN slot. As a silver surfer I am groping around in the dark
somewhat so any help will be appreciated