On the Internet, you can build your business on sale or resale of something. Just can mediate and sell people what they need. Just you yourself shave look.
Building a business and waiting to earn money from it will be time consuming process and in that case it will not serve the purpose of getting money on urgent basis, no doubt that business can help you in long term depending on the efforts you put in developing it, and if I need money desperately then either I will borrow from my friends or family or would sell some unwanted things to get quick bucks.