You are not likely to find a tutorial for something so specific. What you'll need to do is come up with a plan for how you want to implement it and then see what tools you have and what tools you'll need to be able to pull it off. Chances are you will want to have some form of database to collect the rating information, and possibly rater information as well. For that you will need to look into working with PHP and mySQL. So searching Google for a tutorial using those terms might be a worthwhile step.
You gave me a good starting point.