Can I to print/download a revenue report for my company for a particular quarter of 2020 and 2019 even though I just became a Quickbooks online customer a few days ago?

Let me show you how to generate and then print your reports, @userlmburstein18.

Yes, you can run and then download to print your reports in QuickBooks Online. Just make sure to add all the historical transactions you have for 2019 and 2020 before running these reports. 

Here's how to run an income statement or a profit and loss report:

1. Go to Reports menu and select Profit and Loss.
2. From the Report period ▼ dropdown, set the time range of the report that you want to generate.
3. Click Run report. 

Here's more information on how to run reports in QuickBooks Online. From here, you can customize reports to show specific accounts or customers. 

From here, you can click the printer icon at the top of report to print the it. Check the screenshot below:

I'm always here if you need further help in getting the report that you need. Just leave a reply below. Take care and have a wonderful day!