I have been tasked with taking a portrait of each of the faculty members at the University where I work. I have a Canon Rebel XT, some good lenses and a Canon 430EX flash. These are going to be really simple portraits, just in front of a white wall or something like that. My concern is lighting...the flash doesn't always cut it. I'm trying to avoid shadows and I just want to get nice, even lighting. What should I buy as far as a really basic lighting setup goes? What exactly would I need to order to accomplish this? I've been an amateur photographer for several years now, but really know nothing about professional lighting equipment.