Short Answer 
Start your letter by sharing your excitement about attending a new school and highlighting its unique features. Describe the environment, classes, and projects you enjoy, while also connecting personally by expressing how much you miss your friend and suggesting a video chat to catch up.
1. Share Exciting News
Start your letter by expressing your excitement about the new school you’re attending. Mention the school’s name and highlight how it’s different from your previous experience. This sets a positive tone for the letter and grabs your friend’s attention. For example, you can say, “Guess what? I’m going to [School name], and it’s totally amazing!”
2. Describe the Environment and Activities
Next, dive into the details of the school’s environment and the classes you are taking. Give a vivid description of the building and any unique features that stand out. Then, talk about the subjects you’re enjoying, especially a project or class that you find interesting. You could note, “The building is [Describe the building], and we have a [Mention a unique feature]. In [Subject you like], we’re actually doing [Describe a cool project].”
3. Connect on a Personal Level
Finally, make your letter personal by mentioning how you’re missing your best friend and the fun you have together. Share about someone new you met and your shared interests to show you’re making new connections. Wrap up by suggesting a video chat to reconnect and catch up on each other’s lives with a closing line like, “How’s everything at your school? Let’s video chat soon!”