For me when I start any Unreal project the first thing I do is add a sky. There is nothing better then Ultra dynamic for me. Here is a noobs breakdown of the plugin to get you started. We go through the basics of this beautiful thing.

The good the gooder and the damn thats amazing of the plugin..
I love this plugin and want to share it with anyone wanting a total solution for Lights n weather.

Hope it helps:)
enjoy:)