Of course that you can get good gains while trading, but it is not for everyone.
Start with a small amount and learn heavily.
I see this advice given a lot and I disagree with it, a person that has no experience in trading is going to lose his money no matter if the capital is small or big, then that person is going to want to recover that money and he is going to put even more money into risk with the same results, so in my opinion you should start trading only when you have a system that works and that you have verified by trading in paper at first.