There are many online businesses you can venture in to. You have to know what you like doing. Are you good at selling? You may want to try Ebay. Are you good at writing? You may want to start a blog. You can create a blog about topics you are interested in, such as sports, cooking, personal training, money management or whatever you are good at. There are plenty of opportunities that you can try. Once your site starts getting visitors, you can add ads from Google. Sign up for Google Adsense program and they will place ads pertaining to what you blog about on your site. You can make extra money also by conducting surveys online.