For the first 3 - 5 years stage, click on the ball, and then click on the bucket it is supposed to be in. For the first 9 - 12 years stage, hit the Question block and something should come out of it. Then, make your way over to the pipe, hop on top of it, and press the down arrow.
This is the prototype for my final project of 6th grade! Finished after 5 - ish days!