Learning to sketch is easier than it sounds, yet it can be an extremely effective way to convey ideas to your team and to your customers. Rather than going through lengthy explanations of what you are trying to accomplish, a sketch can easily show shapes, flows, interactions, and outcomes quickly and succinctly.
Some of the greatest ideas have started out on the back of a cocktail napkin. Practice early and often to integrate this easy way to communicate into your set of skills.
You don't have to start off creating complex interactions - practicing drawing lines, squares, and circles will help you develop confidence and artistic ability.