From start to end, just like Basic programming, name all the files in the package that will be used. At that point in time. Then which is the end class to use. The Main class is the class that controls all the class files within the package. Then the ending file. Main class then written with all its member classes with the package to function systematically as a package. Making up a unit of task to perform functions and needed data as the output. So write the Main class with those criteria in mind.