Hello
Please us below link that explains how to connect Azure Data Factory to SQL Server On-Prem. Consider that you will need to install the Self Host Integration Runtime
https://learn.microsoft.com/en-us/azure/data-factory/connector-sql-server?tabs=data-factory
calculate the price is quite tricky so cost will depends on many factors (not onlt the rows you will move)
use the azure cost calculator as a reference