Storing data involves operations that take place both on Sui and storage nodes, such as purchasing storage and registering the blob ID. You can start with exploring the Walrus developer guide for a comprehensive understanding of their operations and how to integrate them into your Sui smart contracts.

Yes, it's definitely possible to store data on Walrus from a Sui smart contract. However, as of now, there aren't any official examples or specific documentation directly addressing this process. For more detailed information and code references, you can check the source code for the Walrus smart contracts available here: Walrus Smart Contracts Source Code.