Here you can estimate the costs for compute and storage.
https://azure.microsoft.com/en-us/pricing/details/sql-data-warehouse/gen2/
Also, iIf you're considering a hybrid scenario, where your source systems and applications are on-prem and your DW is in Azure, then consider that it will cost $,$$$ per month for an Express Route connection, and then outbound data transfer is billed per GB.
https://azure.microsoft.com/en-us/pricing/details/expressroute/