As soon as your offer has been accepted you may start to contact all your service providers to compare quotes and to coordinate connection date. In some cases the utility companies may ask for a deposit, you will need to go in person with your purchase contact to confirm with them your new address. 

Don't lose touch with your family and friends, attempt to notify them as soon as possible of your new mailing address. Following link(s) will help you out in announcing your new home address.