When choosing a background light, determine whether you want to light the entire background or just the center of the background. If you’re trying to light the center of the background, you can place a grid in front of your light. These grids come with openings in 10 or 20° increments (most commonly used is 40°). This is based on how far away your light is from the background and how wide you want the spread.
Now that you have your portait lighting setup and you have taken those images, head over to this link for some post-processing. This tutorial covers Cloning and healing.