How can i trade in share market? I can invest up to $1,500 for six months?

Trading and Investing are two different things. Trading should be a long term thing. Although your trades are in the short term, there is always a possibility of loss - you can't always win. And that's the inherent risk in trading.

So if you need the money back in 6 months, just put it your bank account.

But, if you treat trading seriously and professionally, it can pay off... Of course profits are never guaranteed.