What you Need

          You need only 2 things to get going, a text-editing program and patience.  Editing or creating a list file can be a hardy experience and not one to take on lightly, but neither is it impossible to do.  Paying attention to the syntax of how a tag works will save a lot of headaches when it comes time to test your modifications/creations within PCGen.  Using existing list files as a reference can help you to understand how to construct anything you want to, from classes to feats, to spells, if you need an example, there is something in there for you to look at.