Forget apps. Everybody is trying, and you have meager chances to be the next unicorn.
Forget a toll parking lot in the city center. Cars are not fashionable nowadays.
Forget drug smuggling. Most stakeholders would raise eyebrows.
This is a time of reconstruction. You need to start by fulfilling the very basic needs to set up a sustainable business and to foster further growth in the system.
1 ) Find your niche
Let's focus on basic chemistry. Take Italy, my country. Years of bad politics and management destroyed the production infrastructure of the most basic bricks of the industry.
UN COMTRADE database collects customs declarations from all around the world. A simple query highlights sustained demand for many basic chemical products.
A few examples here below (all figures in USD)
Pick your product. There has to be sustained internal demand from a decent number of clients. You do not want to get stuck with a single customer.
2 ) Define your plant
Aim at the right product capacity. 20-30% of imports is probably a good target. It is big enough to catch the attention of the internal market, but it will not disturb the world trade of the product.
Select a few candidate technologies. CAPEX, Utilities, and feedstock consumptions are important but do not underestimate safety and environmental compliance (aim at zero impact, that's possible). This is what will make your plant accepted by the community.
Think about the plant-site with your market in mind. Logistics should play in your favor.
Get a quick CAPEX estimate and run a preliminary financial simulation.
Does it work? Go to the next point.
Doesn't it? Wrong product: go back to point 1.
3) Create conditions
Explain to your future customers the advantages brought by your project: customizable product, simpler logistics, lower costs, robust dependability. Go to the banks with your clients.
Do not forget the community and the authorities: demonstrate that your project is going to improve the industrial infrastructure, to foster further growth, to employ people. And yet, the environment will be as green as before. Or even greener.
Get all stakeholders involved. Get their feedback, update your project accordingly. Share the perspective benefits.
4) Build your plant
The human factor is essential. Follow the project in all details. Hire sound technical people, with the product flowing in their veins.
Check and understand what the contractors are doing, but also help them to deliver quickly and smoothly.
Keep communicating with all the stakeholders. Have them take ownership of the project.
5) Enjoy your business
Your plant is running, and there will stay for the next 30-50 years. This is your compensation for fulfilling the needs of other industries and of the community.