I'd be delighted to help import your data from QuickBooks Desktop (QBDT) to QuicKBooks Online (QBO).
Since QBDT 2016 is an outdated version, you may need to use an upgraded version of the software when importing your data. But no worries, you can download a free trial version and use it in transferring your files to QBO.
Before we start, let's secure a backup copy of your QuickBooks Desktop company file to make sure that the data will be saved before upgrading. I'll show you how below:
Go to the File menu, choose Back Up Company, then select Create Local Backup.
Select Local Backup. Then, click Options.
In the Tell us where to save your backup copies field, select Browse and select the location in which to save the backup copy.
Hit OK.
In the Create Backup window, specify whether to back up automatically, and select Options to set options for automatic backups.
Select New to set a backup schedule in the Schedule Backups dialog.