I'm always saying how a rubric can help eliminate arguments with your students about grades, because it helps them understand why they received the grade. I also believe in posting the rubric before a project, to clarify what your expectations are for students.
I saw this really fun online tool for creating rubrics. Yes, it is geared toward K-12 grades, but it works well, and sets up a nice format. The website is called Recipes4Success and the link is: http://recipes.tech4learning.com/index.php?v=pl&page_ac=view&type=tools&tool=rubricmaker
There are templates you can use, or you can create a custom rubric. Enjoy!