New to Mining, What Advice Do you Have


I am new to mining. I have just setup my first 8 gpu mining rig. I bought the initial rig from BitPunisher on Ebay. It came with one GPU. I have now installed an additional 7 GPUs. Does anyone have some advice on what I can be doing to increase my profits? Which pool do you recommend? Which mining software? What overclocking settings should I use. Thanks in advance.