So you want to become a paddling instructor do you? Good choice. The first thing you need to do is to get connected with your local paddling club or school and take some classes to make sure that your paddling skills are at a demonstrative level. That means that you need to perform all the required skills for the level you are going to be teaching perfectly.
Once your paddling chops are up to speed, you need to take an actual instructor course. During the course you will learn how to actually teach the skills that you have been diligently working on. You will also learn for example, how to look at a forward stoke and figure out what is wrong with it and how to help your student improve.
You have chosen a wise and enlightened path young grasshopper. Take a peek at our links page for local schools and paddling Associations that can help you get started.