There are over 16,000 banks and credit card businesses that participate in the free QBO bank integrations.
You will want to first create the bank (checking type) in the Chart of Accounts and then click the banking tab. Click Connect and search for your bank institution. You will follow the security prompts to connect. Pay careful attention to linking the correct account from the dropdown. You also will get the chance to select a start date.
It's always best if you can get the bank feeds started as soon as you open up your business checking account. If you have been in business for more than 1 year then you will need to make a decision with the help of your tax preparer on which is the best date to begin your QBO checking register.