I'm new to photography and I'm gathering equipment to start doing family photos with my new daughter. So far I have a Rebel XT 350 with a 50mmEF1.8 lens. I've been looking at the possibility of buying a 420ex and/or 580ex flash so that I can use the slave capability. My question is: what is the difference between setting up a studio with mulitple flashes versus setting up lights? And, without spending out of the ballpark, anyone have any ideas as to what would be an appropriate plan for a "startup" home studio?