Try GW's chaos black, highlight it with shadow grey, or any grey really, and put on a black wash? The chaos black has a bit of a shine, it's not as flat as primers usually are.
Water or Vaseline work well. I mostly use water since it's rather easy, just make sure your tools are ALWAYS wet. And to let the GS harden a bit (about 15-20 minutes) before you start the small details.
I've just purchased my rulebook and I am awaiting the arriving of my minis. I'm very interested in the game and I have a few questions. Is there a question forum?
Also, It's nice to be here and I hope everyone is glad to have me as I am to be here.