I'm ready to start buying some lighting for inside. The shadows and the on board flash are making me want to cry. So, I'm looking at the stands and the umbrellas...YIKES...there are so many sizes. How do I know which size to choose? 30, 32, 33, 40, 45, 43, 60...and so on. WOW. I don't even know what to think now. Any help on how you choose something like this would be appreciated.