Answer:
Dear Sister,
I am so happy that you are coming to join me, mom, and dad in the city. I know it might be a little different living in the city, than it is living in the village. I can give you some tips on how to live the "city-life". One thing you need to know is the clothes to wear. I can help you with finding the trendy clothes that people are wearing. Second is your looks. I know you probably don't wear makeup. I can help you buy some makeup, or you can use mine. I know you have a phone, but I also know that you don't use it a lot because not many people in the village have phones. Well, in the city, almost everyone has or uses a phone. Many people use social media apps like; Insta, Snap, Tic Tok, etc. I think you should get these apps and start living the city life.
I will be able to help you more once you get here. I can't wait to see you. Mom and dad have been talking about you since they first found out that you were coming to the city to visit us. Hopefully some of this "city-life" info will help you to connect with people and getting used to the "city-life". I want you to remember this info about "city-life" for if you need to know how to act around city-people if you come and visit again.
I can't wait to see you soon.
Your Sister,
(Your Name)