There are many things that go into writing elegant code, but I can't think of any other special rules that you should be following right now.
Eventually, you will want to include some Javadoc comments within your code, which is discussed in Appendix B of the Skrien textbook, but for now your main focus should be on adding functionality and getting the code to work, while also choosing good/meaningful names for your class names, method names, and variable names.
