Simple arduino ethernet communication for beginner

Hi All also a new comer! - trying to get my head round Arduino / Ethernet .
Need some help
I can use "get" to turn on / off led but need to be able to read an analogue digital value to control the brightness / speed of a light or motor.
I would appreciate some sample code to read /convert the http value (string?) to control the arduino analogue pin. Keep searching but can seem to find what I am looking for so any help guidance would be appreciated.