The following advice will help your move go as smoothly as possible:

1. Introduce yourself: Let your new flatmate know who you are and what you like to do.
2. Show them around: Give your new flatmate a tour of the flat or house, including where important things like the kitchen, bathroom, and living room are located.
3. Set boundaries: Discuss expectations for things like noise levels, guests, and cleaning to avoid any misunderstandings.
4. Share information: Share important information about the area, such as nearby grocery stores, laundromats, and public transportation.
5. Be respectful: Respect your new flatmate's privacy and personal space, and try to be considerate of their needs and schedule.
6. Communicate: Communicate openly and honestly with your new flatmate to address any issues or concerns that may arise.
7. Make an effort to get to know your new flatmate: It's important to make an effort to get to know your new flatmate and build a friendship. You can do this by inviting them to hang out, cooking meals together, or having a movie night.
8. Be a good listener: Listen to your new flatmate if they have any concerns or issues, and try to be understanding and helpful.
9. Be patient: Remember that it may take some time for your new flatmate to feel comfortable and settled in. Be patient and understanding during this transition period.
10. Have fun: Finally, don’t forget to have fun and enjoy your new living situation. After all, you’re sharing a space with someone new and that’s an exciting opportunity to make a new friend.
11. Be respectful of each other's belongings: Make sure to not use or borrow your new flatmate's things without permission.
12. Share the common spaces: Be mindful of how you use common areas like the living room, kitchen, or bathroom. You can make a schedule or set time limits for use of these spaces.
13. Discuss bills and expenses: Set up a system for dividing bills and expenses like rent, utilities, and groceries. This can help prevent any misunderstandings or financial issues.
14. Keep the living space clean: Agree on a cleaning schedule or divide cleaning responsibilities. Make sure to keep the living space clean and tidy for the comfort of both flatmates.
15. Encourage open communication: Let your new flatmate know that they can come to you with any issues or concerns they may have. Encourage open and honest communication to keep the living situation comfortable for both of you.
16. Plan social gatherings: Plan social gatherings or activities together with your new flatmate. This can help build a positive relationship and create a more comfortable living environment.
17. Show interest: Show interest in your new flatmate's life. Ask about their day, family, friends and hobbies. This will help create a strong bond between you.
18. Be a good listener: Listen actively to your new flatmate when they are speaking, and try to understand their perspective. This can help avoid conflicts and build a positive relationship.
19. Show appreciation: Show your appreciation for your new flatmate when they help out or go out of their way to make the living situation more comfortable. A little bit of appreciation goes a long way.
20. Make an effort to be friendly and approachable: Make an effort to be friendly and approachable. Smile, say hello and good morning, and make small talk. This will help create a more pleasant living environment.

In conclusion, sharing a space with a new flatmate may be fun and fulfilling. You may make the move as easy and comfortable as possible by paying attention to these suggestions. Always remember to say hello, establish clear boundaries, engage in open communication, and make an effort to get to know your new flatmate. For both of you, creating a good and comfortable living environment may be facilitated by demonstrating respect, patience, and understanding. Always remember to listen intently, express gratitude, and make an effort to be kind and accessible. You may establish a solid and gratifying rapport with your new flatmate with a little bit of time and effort.