That will take years. Then you can think about teaching. People will learn by example. Maybe you have enough money or other resources that you can. When you are ready to teach, your abilities to communicate, speak the language, listen, and laugh with people and at yourself will be a tremendous boon.
Drawing is very useful communication that cuts through most language barriers.
Honesty is also valuable - but learn how criticism is best received before trying to communicate it in the way you do at home. Be a good ambassador for the positive aspects of your culture, and dispel a few dangerous myths about it where you can. No doubt you will return with much of value to share, a first-person viewpoint of a faraway land, new ways to give, and delightful celebratory customs. Go in Peace.