This is not the place to learn how to do penetration testing.
Having said that, there are plenty of tutorial on the net that will aid you. You should definately start looking for some sort of methodologies to follow. There is no 1 perfect one, so it is up to the person doing the testing take what they need from the various ones available and to even create their own if needed.
http://en.wikipedia.org/wiki/Penetra...#Methodologies
http://www.pentest-standard.org/index.php/Main_Page


