While this may seem like just another thing that’s added to your plate, make copies of all of the keys before you move. In all of the chaos of the move it would be easy to lose a key, and that is the last thing you want to deal with on your moving day.
Start collecting moving supplies long before the move.
You will need to have a forwarding address for your mail so that your letters go to your new place. You can do this on the USPS website.