What business is easy to run, has a small capital, and does not require expertise but rather large profit margins (both online and offline business)?
Service Companies have minimal startup as they do not require inventory only labor and generally you only payout this labor when you are being paid for it. The margin on labor can be exceptional and if you have the ability to scale it where you are making labor off of many people it is quite lucrative. I have personally made millions on service companies and continue to launch them.