Hi, u can join me in my business, click on my avatar n email me :)
For such a low amount your business must have the following requirements.No license.Little or no rent.Low or zero stocks costs.People who have gone this route include newspaper vendors, drink sellers, illegal hawkers, home masseuse, the list is plenty.
Singapore is one of the high cost living city in the world. With $500 you can t start any legal or register business here. Please think of some thing else or start to save up for a bigger capital then think of starting a business. Best wishes.