If your planning on building a business out in the world "not online"
Then you're gonna need Capital, if you don't have the funding for such you can try to get a sponsor. Check out http://www.profounder.com/.
If you wanna start a business online, then you'll need minimum and sometimes no start capital. Business areas like affiliate marketing that has the potential of generating thousands of dollars a day, doesn't require much investment, and sometimes none at all!
Others such as network marketing, and MLM. Doesn't need much investment either. Here you would like to create your own product such as an ebook or ecourse to market.
And many more Internet Marketing ventures are availible out there. Just gotta know where to look.