eBooks? What are they when they are at home?
They are basically virtual books in the form of Adobe PDF documents, and they are one of the most widely used "Get rich quick" schemes used today on the internet.
Most of the time, they are scams. They promise that if you buy the book, it will tell you how to make easy money. The truth is - they simply tell you to resell the eBook, and that's how you make your money.
So the buyer is getting something that isn't really of any value, and the advertiser is making free money. Its not exactly 100% honest, but its a way of making money using the internet.
We believe that this type of money-making will be outlawed soon, so its probably not worth you looking into.
If you do decide to go down this route, then make sure that your not advertising something you will not deliver, as this is when you can get in trouble.