I don't do much photography for real estate listings (though I used to). It's certainly a good source of income for many photographers. It's not an artistic endeavor, rather a technical one. I'm going to give you a quick lesson in this type of photography, so you can do it well.
Two lenses. An ultra-wide angle with a field of view of at least 90 degrees, the other a lens that covers about 60degrees. That would be a 35mm lens if you have a full-frame camera.
Tripod - A heavy one would be preferable
So... Setup your camera at one corner of the room. About waist-height. Make SURE the camera is not tilted up or down. Take five exposures one stop apart, so you get detail in the brightest part of the image as well as deep in the shadows. Make sure you do not shake or move the camera between exposures. (See how the window at the far right of the above image is not blown out?)
Combine all five images using software such as Photomatix, Enfuse, Hugin, etc. The software creates one file that will have detail both in the shadows as well as the highlights, but keeps the image looking natural.
Total time required on location is usually about 45 minutes, and another 45 minutes of post-processing the images.
Crop/resize for your client's requirements.
Want to learn more? Call and I can give one-on-one photo lessons on this or any other subject.
I am a full-time photographer and I also own and operate Riveros Photography, here in Toronto. We offer all photography-related services, including printing, framing, etc.