First notebook entry: Introducing myself

Hello everyone.My name is Yoshiyuki who is from Japan 16 year-old boy.Please to meet you.
My dream is moving to America in the future.So I want to learn English so much. I can teach you Japanese.Please teach me English. Thanks 

Fixed sentences:  1.)My name is Yoshiyuki and I am a 16 year-old boy from Japan. Pleased to meet you. ( When you used "who" you changed to 3rd person. When you introducing yourself  or talking about yourself you should talk in first person.)

2.) My dream it to move to America in the future.( You shouldn't add the suffix "-ing" to a verb unless your doing something at that moment.) 

3.) So I want to learn English. ( Your sentence was fine until you added "so much". If you want to express how much you want something try using " a lot" or "I really want".