Sometimes, less is more. You can do so much with just 1 light.
These shots are taken with a 400w flash and a 178cm umbrella at about 45 degree angle.
Here's a look at the setup.
Simple, isn't it?
Pro tip: Go and experiment! Start with the simplest 1 light setup, use the largest modifier you have, place the light near to your subject at about more or less 45 degree angle, and you can achieve soft and comfortable lighting effect in your portrait. Feather the light if necessary to add or subtract from the background spill.