To make sure you install the right software for the team project follow these instructions. (Make sure you register for a free account for Unreal Engine).
To get a better idea of how Unreal Engine works and how Players, Enemies, Layouts, etc are created and modified, you can watch the video tutorials below.
If you'd like a text-based run-down of the basics, Unreal Engine have this documentation site: Understanding the Basics
An official Unreal video that's a good starting point for understanding lots of different aspects
A good tutorial series from Wayne Fellows on a 2D side-scroller game that covers a lot of the features we'll be using in our games
Another series of tutorials from the same creator, this time on making a Fighter game
Finally, a YouTube channel with lots of slightly more advanced tutorials on games development using Unreal