Know that there are limitations when you convert your file. That includes the attachments, audit trail, and recurring transactions. Once done, I'd recommend running the Profit and Loss and Balance Sheet reports to ensure that you transferred your data correctly. To verify your reports in both products, filter the date period to All Dates and the accounting method to Accrual. For more information, check out this article: What to Do After Converting from QBDT for Windows to QBO.
You can also read some FAQs about converting your account from QBDT to QBO for your benefit.
Keep in touch with me here should you have any additional questions or concerns. I'm always available to help.