How do you get started in home decorating?

I want to help someone in home decorating or weding planning, any suggestions?

For home decorating, you should get a degree in Interior Design. It is an intensive 4-5 year program resulting in a BS degree. Then, to get all your professional credentials, it takes about 5 years of full-time work in the field.
Examples of your work help. Do something with your place(you got to start someplace) for no one wants to be the guinea pig... to make it"cool" and then invite friends over for "tea" so they can see your handiwork. Maybe they know somebody who knows somebody. Word of mouth works the best.