Whenever you purchase a new home whether it is your first or your tenth, if you have a mortgage, you need to touch base with your insurance company before closing. Part of your closing will involve your lawyer's office requesting proof of insurance on your new property before closing. They will require that a Binder is faxed or delivered before they can sign off on the final paperwork. If you get your insurance ready to go, and give your insurance agent your lawyer’s information along with mortgage details, your agent can have a binder sent over and verified before you show up and end up with an unexpected delay.
By preparing ahead you will also give yourself time to shop for the best possible coverage and rates. Home policies can vary drastically both in price and coverages, and you don't want to have to decide at the last minute.