You need to get a better grasp of light quality. Mixing types of lighting, flash, CFL, and whatever you have in the ceiling will cause problems. Each of those has its own color, and you can't correct the white balance in post and correcting one just makes the other sources worse. Get yourself at least two, and better yet 3 flashes. Look on you tube and focus on the following terms, key light, fill light, and background light (sometimes called a separation light).