I am asking for a common question but I truly need the exact answers from the experience photographers. What is the best way to set lighting up for portraits and table-top product shots?
Lighting for portraits tends to be the opposite of lighting for products. Lighting for retail portraits tends to be different then lighting for fashion. Lighting for something like a purse or a shoe is going to be significantly different than lighting for something like a watch or a wine bottle. You really need to start wit the basics, learn to see and understand light then learn how to apply it. As was recommended, I'd start you with a copy of "Light, Science and Magic".

