Recent hot topic in computer circle is E-Bussiness.E-bussiness is through internet.You also can be an entreprenure on internet.You can affliliate with CLICKBANK.COM and advertise /reffer/sell/resell their product on market place.It is bussiness without any investment barring your expenditure on COMPUTER+INTERNET CONNECTION and understaing instructions given on site.
First go to CLICKBANK .com and create an ID.
Click on MARKET PLACE.
Select product which you want to promote
You get a HOP-LINK from clickbank.
You popularise that link through
 Emails,
Give ads on goodle adsence,
Place hopelink in your blog forum. 
Paste banners /hopelinks on your website if you have one.
There are good returns in it.
What are bussiness oppourtunities on internet overall view you can 
get meghvanshi.ecmillions.hop.clickbank.net 
earn  Over A Million Dollars A Year Without A Website.