Buying assets thru Paypal (things that put money in my pocket)

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Ever since 2006 i've been reading a very good book called "Rich Dad, Poor Dad" written by Robert Kiyosaki, and i've even listened to the podcast (even though I haven't listened to ALL of it yet...). In that book and audiobook i've learned about assets and liabilities. I've learned that assets are things that put money in my pocket, while at the same time liabilities take money from my pocket. I do have a desire to become wealthy and rich, but I don't know what kinds of assets there are. The only one I know of is building a business, but I don't plan on buying an expensive franchise or a company. In this day and age of the Internet, we buy stuff online, mostly liabilities or small stuff that aren't assets. But since I only got about almost $40 dollars, I want to buy assets at a low price. I don't live near Wall Street, but i'd like to buy assets online that make money for me. Is there a way to buy assets online, for low cost or inexpensively, and thru Paypal?