First we'll setup the Raspberry Pi, to do this you'll need to have Raspbian installed. You can buy a Pi with Raspbian pre-installed or you can use a 2GB or larger SD card that you already have.
I am using an SD card I already have. Plug the SD card into your computer and download the latest Raspbian http://downloads.raspberrypi.org/raspbian_latest
I'm using windows so I unzipped the file and used win32diskimager (http://sourceforge.net/projects/win32diskimager) to write the Raspbian image to the SD card.
If you are still not sure there is a tutorial here http://elinux.org/RPi_Easy_SD_Card_Setup
Ok now we have Raspbian installed it's time to get our Pi up and running, plug in your SD card, Wi-Fi dongle, USB keyboard, Ethernet cable to your router, HDMI to your monitor and lastly the micro USB cable to the power socket. The first time you boot up you'll end up with the configuration screen.
The changes you need to make are:
- Expand the filesystem so Raspbian utilises the entire SD card
- Change your password
- Enable boot to desktop
- Set your language, region and time zone
Go into advanced options
- Change your hostname so you can recognise your Pi on the network.
- Enable SSH so you can access your PI from a computer on your network.
- Select finish which should restart your Pi.