I'd just like to thank everyone for thier input on this .I guess the best way to learn how the material room works is to just try different things and play around with the settings /nodes in the material room and lights.I 'll read up on some of those tutuorials as well .my only problem is once i make changes to things in the material room can they be reversed?Is there any step by step examples that I can try to see what certain adjustments effect the outcome/render.I really think for me its a conceptual thing .i just can't make the connection as to what ,how the adjustments impact on the material and affect its final appearance.I also see it was suggested that I start of with one light and add to that .So how do I start of with just adding one light?