Convert on-premises physical machine to Hyper-V VHD, upload to Azure Blob storage, and then deploy as new VM using uploaded VHD. Use when bringing your own SQL Server license, when migrating a database that you will run on an older version of SQL Server, or when migrating system and user databases together as part of the migration of database dependent on other user databases and/or system databases. Use on SQL Server 2005 or greater to SQL Server 2005 or greater
Ship hard drive using Windows Import/Export Service. Use when manual copy method is too slow, such as with very large databases. Use on SQL Server 2005 or greater to SQL Server 2005 or greater
If you’re looking for notes on where to get started, this is a good link.