Trading especially margin one is very risky to venture into without adequate knowledge on how it works and you should not go into trading without understanding on how to analyze the prices both technical and fundamentals issues and patterns. As a newbie you are too new to trade with reall money and I will therefore advice you to open a demo trade with those exchanges platform that allows that and use that to develop your skills on when to buy and sell to actually make money and reduce the risk of losing your entire capital.