If they get your wallet and keys: While it is probably rare that the carjacker would use your identification to visit your home, you can call police to have them clear your home, while you have a locksmith change your door locks.
if they got your checkbooks, close your bank accounts
Close and reorder and ATM cards, mastercards, and Visa cards
Be sure you have a record of all your credit card numbers, and associated customer service numbers from the backs of the cards. Especially for any kind of debit card or prepaid cards.
This also includes any kind of prepaid store gift cards
This is one of many aspects of modern life that cause Dave Ramsey, in his debt free seminars and on his radio show, The Dave Ramsey Show, to recommend the first step in financial recovery and the path to being debt free, the first baby step, is to have an emergency fund of $1000.