The Tutorial was created in order to show you the game basics, such as controls:
What abilities Superstars have and how to use them:
As soon as you finish the control/ability Tutorial for your first Superstar, you will be forwarded to arena tutorial:
After you finish the first map, you will get the access to a list of rewards (Superstars, Emotes, Modes and etc.) available for the Tutorial (Rewards and their sequence may vary in the future).
Note: This is a separate season from the current running season which is why you see different challenges and rewards.