Don't bite more than you can chew, learn the little things. Vectors will make your code much less messy. You can find a detailed description of the Vector class on the Processing site. In this way, instead of having two different variables xplode1 and xplode2, there will be one Vector object that stores both values. You may find those concepts difficult at first, but they'll be invalubale tools for future sketches.
If you feel comfortable with basic concepts such as variables, functions, conditionals and loops, start studying OOP (Object Oriented Programming). Again, Daniel Shiffman comes to help.
Also, be more specific when asking on StackOverflow. Solving a problem often means finding the right question.