You can earn your income here in bctalk or in trading there is many way to do earn money in bitcoin. Earn your income then if enough for you then convert it into cash. Or you can earn them to your wallet and wait the bitcoin rise for you to get extra income. Thats the easy way to earn money in bitcoin.
I think trading is a good way to earn some bitcoin. But you have to be very careful. You cannot trade scam coins.