There are many useful advocacy tools and guidelines on various topics. Essentially, they introduce the concept of advocacy and describe the process to advocate effectively, step-by-step, from design to implementation.
The process helps you articulate what you want to achieve through advocacy, identify and understand whom you need to influence, and select appropriate activities to implement your work. Many resources provide concrete examples of advocacy actions in practice, followed by worksheets for adaption or reproduction. Last but not least, they also teach basic advocacy skills and build confidence for undertaking advocacy activities that effectively support an issue.