Here's a short list of what you'll want to include: Facts of the case. An outline of what happened. Statement of the issue. A brief description of the problem. Demand. The dollar amount or action necessary to resolve the case. Response deadline. The date by which the recipient must respond. Noncompliance consequences.
To write a simple contract, title it clearly, identify all parties and specify terms (services or payments). Include an offer, acceptance, consideration, and intent. Add a signature and date for enforceability. Written contracts reduce disputes and offer better legal security than verbal ones.