1__Limestone and Concrete: Set up your first two factories to produce Limestone, which is the raw material needed to manufacture Concrete. Concrete is the foundational resource required to construct new factories.
2__Iron and Steel: Your next two factories should produce Iron, which converts into Steel. Steel is vital because you need it to upgrade your factories' Automated Engines (AE).
3__Upgrade Automation: Higher AE levels allow your factories to produce goods passively while you are offline.
Once this chain is running, you can sell your surplus on the market. Track resource prices daily—buy low, sell high, and watch your capital multiply.