A shortcut to launch Minecraft should be located on the desktop of your computer. If it's not there, let Mr. Locke know and he should be able to install it for you.

When you open Minecraft, you will need to login using your Office 365 account.

Whenever possible, you need to be working in CREATIVE mode. This makes you invincible, allows you to fly, and gives you unlimited access to all of the blocks.