Money is an obvious one. And, of course, having a vehicle to insure and a garaging address is another. A completed application with signatures applies to all polices. Also, each company will have their own unique set of guidelines for what you will need. Lastly, legal requirements can change in different jurisdictions.
Payments to start a policy are mostly made by check or credit card. Many policyholders now a days use an electronic form of payment. For credit and debit cards the account number, expiration date, and security code are needed. For an electronic funds bank transfer the account and bank routing numbers. In either case the account holder, which is not always the policyholder, must provide authorization.
Before a policy can begin the exact Vehicle Identification Number or VIN (17 digit alpha numeric) is needed. Providing the year make and model is insufficient. Each car has a unique VIN which identifies the characteristics for that particular car. Air bag, a