Make Materials look real in PS

Hello design world. I was just wondering, how to make materials look real in photoshop. I have a lot of sketches which I need to render, I use a tablet by the way, and I find my self having problems with photoshop. I mean it seems uses it so I thought that I would give it a try. Anyways, I concentrate on athletic products. So I was just wondering if you guys knew any good tool to use in PS .
Thanks
eden

no good advice. u should watching more and more good product photos and try to conjecture the relationship between lights shadows and matirel.
try to facsimile them in photoshop with the common tools.