I currently live in Japan I would like a trip for me and my five year old daughter

Angela, if it is your first time that you have been to the wall, I think you may visit Badaling section. In fact, you don't need to find a tour guide. When you arrive in Beijing, you may go to Beijing North Railway Station to take S2 train to reach Badaling. It costs CNY 6 per person. Please understand that all passengers don't take their seats according to their tickets. They just take the seats randomly. If you get on the train too late, you may not find a seat.