Well, as far as Business is concerned, Trading in Stocks is extremely high potential for a low capital investment, however the other options you may go for are-

Marketing of a Product with a part of profit.
Seeking for a Franchise of some product that doesn't require much investment

The Key factor to thinking up of business Ideas is that "What people want" and if you can sight that, then there is nothing stopping you, now you need to focus on each place a person goes, what does he require and when, how much, and then note it on a paper, then do your research and whichever thing seems the most deserted and the most Profitable, go for it.

You can also invent something and go for it, I know people successful in that.

Online Web Designing and stuff requires almost no real investment, but lots of people are already in that.

Well, your choice from here

"Roopin"