Wireless Router Help -- For the complete Idiot

Hi, just recently, I was shopping at Staples and all. I have a Dell Laptop and decided to get a wireless router so I could connect in the privacy of my own room.

I Purchased:
U.S. Robotics Wireless Router + PC Card
Kit Model # USR5471-BP
Kit Contents: USR5461 Maxg Wireless Router
USR5411 Wireless Maxg PC Card
Installation Guide
Installation CD-Rom
Wireless Router Power supply
Ethrenet Cable

So, following the instruction on the guide, thinking this would only be a matter of hooking up cables and installing stuff, I was able to successfully install the hardware and stuff for the PC CArd on my Laptop.
Yes, I recived a connection.
However, I couldn't surf te web, access anything on the interent and stuff. I suspect this is because the LAN Cable is unplugged.

Looking to my Demension, I had properly hooked all the nessecary cables in their correct and accurate places in the Router. Another problem. After hooking all the cables, I couldn't access the internet on my Demnsion.

So Basically:
Laptop Situation:
Good: Reciveing Connection From Router.
Bad: Can't access internet.... Suspects it is due to Unplugged LAN Cable.

Desktop Situation:
Good: -----
Bad: After properly hooking up all the cables, I still couldn't access internet.

Problem: Can't access internet, go on the web, or anything even though I think I did everything correctly.

Yes, I'm not very good at this stuff... So if anyone could just essentially walk-me-through the whole process or provide me a link to a similar guide... I'd be grateful. Thnaks! :4-dontkno :4-dontkno