You can deploy a Virtual Machine, with Windows 2019 already installed:
You can also use Azure Migrate to migrate your current workloads into Azure: https://learn.microsoft.com/en-us/azure/migrate/tutorial-migrate-physical-virtual-machines?WT.mc_id=AZ-MVP-5004796
or prepare and upload custom image: https://learn.microsoft.com/en-us/azure/virtual-machines/windows/prepare-for-upload-vhd-image?WT.mc_id=AZ-MVP-5004796
But its recommended deploying using the Windows Server marketplace images into Azure, as they already contain the agents and drivers, and ready for use within minutes.