Real Estate Camera

External Flash vs On Camera Flash
Most of the compact cameras have an on-camera flash that is great for taking photos of people up to 10 feet away. These on-camera flashes are not powerful enough to take high quality interior photographs, an external flash is required to take the highest quality interior photographs. This link points to Digital Slave Flash for compact digital cameras that should work with most compact digital cameras. I like the Zeikos ZE-DS12 Digital Pro Slave Flash or the Digital Slave Flash + Bracket Set for Digital Cameras

Since you will be shooting photos indoors the camera will have to be held steady. Professional photographers use tripod to achieve this. Tripods work great, but a monopod works just as well and is easy to store under your car seat.

Monopod (stores under your car seat) or tripods allows you to hold the camera very steady  to get high quality interior photographs. A monopod can also be used as a camera extender to get mini-aerial shots of patios, pools, exterior shots and more. Simply set the timer on the camera and hold the monopod above your head, it will take a few practice shots till you learn the technique.