Steps to build the Blockchain applications are almost same as building any other app. First, your application strategy and purpose for creating a blockchain app must be clear. Once your vision is clear, you should decide whether you want to have the blockchain database decentralized that can be accessible to everyone, private that are cost-effective and apt for handling and validating data transactions or hybrid that combines both private and public blockchains.
Public Blockchain: You may plug into an existing public blockchain network such as Bitcoin/Ethereum. Private Blockchain: you may create an isolated blockchain network via running the blockchain software without third parties open access or may use trusted peers partners. You may use the cloud-based solution providers such as Amazon Web Services (AWS), IBM Bluemix and Microsoft Azure.