Hi there,
Congrats on starting a new company. QuickBooks Online makes it simple to start on a clean slate and I'd be glad to show you how to either enter beginning balances or import your transactions.
Since QuickBooks gives you the flexibility to do both it's up to you to choose which option you think works best for your business. If you decide to enter beginning balances, here's a great article which shows you how: Enter opening balances for accounts in QuickBooks Online. If you decide to import transactions, here's how: Import bank transactions using Excel CSV files.
I also encourage you to check out some of our tutorials on using QB Online. You may already know most of the info but here are the tutorials just in case you need them: QBO Quick Tutorials.
Let me know if you have other questions. I'm here to help. Otherwise, enjoy the rest of your week and stay safe! :)