New in Aberdeen starting from Jan 2018

Dear all,
We are moving to Aberdeen in the beggining of next year. I am very excited, however I don't know anything about the city. My husband is going to study in RGU and we have a son that is 6 years old and he should enter the first grade. I think I need orientation about the schools, how the process of enrollment is done? If there is any Expat Mom group over Internations or Whatsapp? All kind of help is highly appreciated. Thanks, Olga