Go to the right of the Training Room and click Rexxy.
After that go to Forest Floor and click Stretch.
Then go to Prairie Pool and click Pterry.
Finally, go back to the Trianing Area and click Horns.
After that a message will pop up telling you that you are now level 1.
In the end, click the Sling Shot Spot and buy ammo for your new Sling Shot.
Now, shall we start with Quest 1?