It is most definitely not like gambling. Gambling is all luck and chance, no skill. Trading requires an educated view of the economy and a little knack for psychology. Check the news. If there's any big happenings, invest on them. Like the recent bitfinex hack, time to buy.
Trading is good according to me, because you can make profit with the help of bitcoin price raise and fall.
For do a good trade You can start invest by small amount in sites like localbitcoin.com with the good account which have nice trust and volume...