Order of submission mining/transactions

First ...this tutorial is just great. I'm new and learning.
Is the script such that you submit a mining request and then send the transaction?
How can the program be adjusted for smart contracts/dfiapps?
Is the blockchain such that it is a global directory that can accept different and multiple submissions (transactions)..$, smartcontracts, dapps..etc.?

The issue names no files, tests, or entry points. First review the tutorial's mining-request and transaction flow, then clarify whether the goal is explanatory documentation or changes for smart contracts and DFI apps. Done is not defined until one concrete scope and expected behavior are agreed.

Written by the indexing model from the issue text.