I have been trading options for over a year and my advice is you can pretty much forget about trading in options on individual stocks. There is simply not enough liquidity in even at-the-money options and you will get killed by the slippage.
Nifty options trading is possible, though even those are not as liquid as one would like. I find that the best way to trade options in our market is to adopt a strategy to take advantage of the time decay, as the actively traded options are always the near-month options that lose time value rapidly in the second half of the month. Best strategy is to write out-of-money options (somewhat risky) and put on credit spreads a week or two before expiry.
