Thank you Mohan,
I believe you get the best of earnings for all the efforts you would put into your trading account. Since you have experience trading NIFTY, that is very much sufficient in trading commodities too. All markets work the same way, you just need to know a little bit about their structure and more on observation.
Take small exposures, learn from every move you make. Markets keep teaching us what we need on every trade, if we commit that we don't repeat our mistakes. That will go a long way in your path as a successful trader.
In every trade we make, making money may or may not happen, but every trade will have a experience unique to each trader. If we don't learn from a trade, then it goes a waste doing it. So observe every move, record your trades along with your emotions while in the trade. Go back often to check with your records. It will teach you what you personally need to know.
More on the psychology of trading, keep in touch.