I am looking at purchasing the 50mm F1.8 lens, is this good for shooting active kids?

I'm planning on getting my first fish eye lens, and wonder if there is a best way to use it and create a great composition.

I've got kids in all sports, football to gymnastics... which is the best lens do I use to capture them?

I opened up Canon.com to research a new lens and found myself lost. I can narrow it down by the type of pictures I want to take but after that, I just don't know how to choose a g …