Learning Studio Lighting!

My uncle gave me a portable light with an umbrella a few months ago and I haven't had the time to try anything until today. I bought a backdrop stand and a roll of white seamless paper and went to work! My first volunteer (well not really a volunteer, she just came over to see me and I asked her to let me try it on her!) was my friend Dena who I haven't seen in a long time. I don't have any knowledge of this stuff at all so any help from you fellow photographers reading this would be great! I have one light and a reflector in this image. One day I will be able to create masterpieces, but today, they are just pieces! Here is Dena!