In the beginner's guide there  a walk-through by lobster read that / work through it, all your questions are answered in there. He also responds to the comments at the end so you could post a question in there if you need as well. If I was to hazard a guess as to what is missing I'd say you haven't installed the ATI OpenCL stuff. You also should check where your card falls on the GPU guide here. http://melanarchy.info/bitcoin/