What a cute little baby! Her expression in the last shot, bottom right, is precious!
For a first-ever set with new light, ya' did pretty good! Your whites are a wee bit "hot", but some refinement and improved lighting control will come to you if you pay close attention to the exact lighting setups you used. This is where an actual flash meter can really help you in determining the *exact* right amount of light to apply to the subject's seating area, and to the background, so that you have the most easily-workable basic image, for the least amount of post-processing, and the easiest amount of post-processing refinement of the original capture data.
The Sekonic website has some good flash tutorials that talk, and SHOW, how to use their meters to get the right exposure by using a meter.