The rule is quite simple ,invest in proportion to your age.
eg if you are 55 years old than 65% of earning in banks,fd's post ofc savings and 35% in equity to hedge against any unforseen situtations.Life span is taken here as 80 years.

First, be sure that you are ready to take risk. Get prepared to lose that money. Keep only that money in stock markets which you can afford to lose. It’s always a game. You need to get hold of the right time. You can gain, but there is every chance that you lose too. Take expert advice before you proceed. If you want to choose safe investment avenues, put your money in bank fixed deposits.

Nowadays, since last few weeks almost all the sectors are performing well. You can go for IT stocks, infra and real estate stocks.

Don’t wait for market bottoming. Enter the market when it is witnessing positive trends and choose your stocks considering how much you would like to invest.