There are a few different ways that you can find revenue in QuickBooks.
If you go to the "Reports" menu, and then select "Profit & Loss", you can see a report of your revenue, along with your other income and expenses.
Alternatively, you can go to the "Customers" menu, and then select "Receive Payments". This will show you a list of all the revenue that has come in, and you can filter it by date range to see specific periods of time.
You can also go to the "Vendors" menu, and then select "Enter Bills". This will show you a list of all the expenses that you've incurred, and you can filter it by date range to see specific periods of time.