How do I build a blockchain use case?

1. Private Ethereum Network

Setting up a private ethereum network can really be fun if you are little familiar with NodeJS and linux administration.

2. Smart Contracts:

Smart contracts are the Blockchain way of rules engine. Though there is more to it.

3. dApps:

Decentralized apps are the major reason to start things with. Identify whether a reference to Solidity and Truffle to give you a kickstart.

4. Hyperledger:

The hyperledger fabric allows you to set up your own blockchain network and start writing your dApps. They provide docker images and even chain code support to give you a kick-start.

5. Blockchain as a service:

This is what IBM is doing with its Bluemix. They have set up templates of blockchain networks around hyperledger-fabric 0.4, and 1.0. Now all you need to do is set up a dev account and they provide clone of the same.