In this video, I show you how to get a Roblox account, install Roblox Studio, create a simple game with one part, test your game, and save it to Roblox.  

Roblox Studio: (for building Roblox games)

https://www.roblox.com

For movement: 

W front, A left, D right, S back (both playing and building).  Look around by holding down the right mouse button.  

For your windows: 

View tab -> Explorer (stuff in your game)

View tab -> Properties (if you click on something in the explorer window it shows its properties)