small scale business are the key to initiate large scale business in future so if you become successful in small business surely you will have gain experience of large scale business too. Also remember that in your business will be successful for long term if it is based on your desire and citizen's needs.
Like you really understand how to read situations and conditions. Yes. Business people must be observant in everything. If a Chinese person wants to open a shop, he surveys the market and chooses/looks at a strategic place and also counts the number of people passing by and also calculates the potential who will stop by if he builds his shop in a matter of hours, for example.
If the capital is small, the reference above is good too, but it's better to just sell liquids or just daily necessities and the money will turn over quickly.