You will need several lights, but an inexpensive way to do it is to use slaves that fit in standard sockets, in the existing fixtures. Alternatively, you can hide your slave flashes behind the room lights (behind as in "not visible from the camera position").
As for lenses, a 24mm will just work, with certain room shapes only. A 20mm would be preferable if you can get one. As other folks pointed out, use a tripod, and keep the camera level to avoid distortion. Good luck! Pat White
