Arduino Ethernet Client, reading and parsing a web page

steps I needed to make an arduino client looking and parsing for information online

1) you get your arduino working and you know how to use the serial monitor to debug

to know more, look here:
http://arduinobasics.blogspot.com.br/search/label/Serial%20Monitor

2) the ethernet shield is plugged to your arduino board and plugged into an RJ45 cable right on to your router or ethernet switch.

you need to find out the arduino's shield IP address with the following code example on the arduino library:  DhcpAddressPrinter

check more here: http://www.instructables.com/id/Arduino-Ethernet-Shield-Tutorial/all/?lang=pt

3) get your arduino to connect to a webpage and to parse data from it

nothing to explain here, this blog article is very well written:
http://bildr.org/2011/06/arduino-ethernet-client/

Now you should be able to get the result on your webpage through the serial monitor.