I am currently painting a Necron army and I used the following tutorial:
http://mrleespaintingemporium.blogspot.com/2013/07/guest-tutorial-necrons.html
It is very fast painting and doesn't require a lot of experience as you are just dry brushing for the most part. I have painted 36 warriors, 15 bases of scarabs, 1 spyder, 1
HQ, and 1 triarch walker in maybe around 5 hours and I think it is a pretty good table top quality.