You can never know. I would you rather invest in learning how to trade so you won't always buy tops and sell bottoms. That $1,500 capital will go a long way if you have the discipline and courage to learn. Many people refused to learn, they are now gone.
As said it is impossible to find the exact bottom. As the market is not same as world market it is quite hard to predict the moves precisely. Good is to learn the process of trading where profiting is made out of the price variation happening with time. This is little risky, because the market moves can change in any direction without any prior indication.