I've posted these before, probably answering a similar question. These are all Norman strobes, but the theory is the same no matter what system and power levels you're using. This is the setup I use for white-background catalog shoots, and you can see the results (different model) below. This is just one setup - what you want to achieve will dictate how you set up the lights, and what modifiers you use.
Regards,
Andy Pearlman
Andy Pearlman Studio