That pretty much depends on what interest you want and how much risk are you willing to take.
If 1-2% in a year is enough for you, put your money into bank and forget about it.
If you don't like risk and agree to make 13-14% in a year, share market is for you. Go buy some google shares
If you want an increadibly high interest go look for a HYIP to invest in.
I invest in some of those making around 20% monthly, but the risk is very high, you can lose your money very fast.