Here is how to create a storage account: https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blob-create-account-block-blob?tabs=azure-portal
This first part shows how to create a storage container: https://docs.microsoft.com/en-us/azure/storage/blobs/storage-quickstart-blobs-portal
How to get the storage account key: https://docs.microsoft.com/en-us/azure/storage/common/storage-account-keys-manage