Makerson the Robot

My first robot with very little to show. He's built on the top of a container and uses code I got off the internet. I want to learn more about programming and eventually make my own code for him. My next add-on will be bump switches for use when Makerson gets stuck because of the blind spot of the Parallax PING)). OH, and his name was inspired by make magazine, my favorite. I think he's pretty good for a fourteen year old to build. Please comment on how to make my code better and how to add bump switches. The code is in the link.