You should start out the letter stating all of the relevant case information. You need to tell the judge your name, case number, charge and sentence imposed.Court Forms and Instructions. Completing the Forms. You may be able to complete your hours online. There are several online platforms that offer court-ordered community service opportunities. In this article, we will discuss how to write a formal letter to a judge, along with the proper format and a sample letter. To fill out this form, ensure you have the necessary court documentation ready. Follow the step-by-step instructions provided and gather any required approvals. A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things.