Simply replace the unfilled areas such as "[]" and "[date]" with your information.
Dear,
I am so excited to hear that you have purchased a new house. I bet you are completely thrilled about your family's future in your new home. It is in an excellent community where you can plant some roots.
Moving can be both a very happy and very stressful task. There is packing, moving, unpacking, painting, and all of the other errands that come with a new home. Please ask for help when you need it so that you aren't too overwhelmed to enjoy your house. I think you will find that your friends, family, and even your new neighbors will be glad to lend a helping hand.
Let me know if there is anything I can do to help you.
Sincerely,