Wi -fi set up

[masterbill]

Hello,

I got a Dell desktop with Vista Home premium on it and I want to connect to a laptop and phone.
I'm not to daft on computers and I'm pretty sure I know what I need but before i go to PC world etc

What's the best way to go about ?
What do I need ?
Any does and don'ts etc

Cheers Bill

Ps I've got virgin broadband - don't know if that alters things