To create a wireless network you need:
1. Two or more computers, each with a wireless network adapter installed. To make it easy you can buy USB adapters that simply plug into a USB port, but if you're not averse to opening a computer's case you can install a PCI card adapter for slight better performance. A laptop needs a PCMCIA card adapter - if it doesn't already have wireless network access built in.
2. A wireless router. This enables one computer to see, and access files on another machine, and you can transfer files between machines. If you buy a router with a built-in ADSL modem you can share a broadband internet connection between the networked computers. Alternatively, you can use a non-modem-equipped router with an existing Ethernet broadband modem.
Is that what you wanted to know?
I think that answers my question doesnt it? There is nothing else that i will need?