For those willing to take on the task of managing a property, real estate can be a powerful semi-passive income stream due to the combination of rental and principal value appreciation. But to generate passive income from real estate, you either have to rent out a room in your house, rent out your entire house and rent elsewhere (seems counterproductive), or buy a rental property. It’s important to realize that owning your primary residence means you are neutral the real estate market. Renting means you are short the real estate market, and only after buying two or more properties are you actually long real estate.
There are a few advantages to taking this approach. First, you get close to 100% of your listed price (minus the transaction fee of your preferred payment gateway). Second, you are not competing with other authors and have the reader’s attention solely on your product. Third, selling your eBook on your own platform is a great opportunity to build a long term relationship with your readers via email. Fourth, you can bundle your eBook with other goodies in order to bump up the value and make it more unique. With so many advantages, it's worth putting up the time and start building your own platform.

Yes, good point about not blatantly copying other people’s hard work. I should have said in my original post that I would NEVER do that. I have eight years’ of University education behind me which resulted in three degrees, including a Masters. If I learned one thing at college, it is that plagiarism is, as you say, SO not cool. Not the done thing. I plan to give full attribution to the originating author and paste a link to their website on my website so my subscribers can follow up the data with the source if they choose to.
I use a property manager to handle my rental properties. Most months, my only involvement is checking my bank account to verify I received my checks, then making a payment to the mortgage company. If you don’t have enough money to buy a rental property, you can get started investing in real estate by buying a REIT stock or investing through platforms that let you buy a partial interest in a building.
4. Calculate how much passive income you need. It's important to have a passive-income goal — otherwise, it's very easy to lose motivation. A good goal is to try to generate enough passive income to cover basic living expenses such as food, shelter, transportation, and clothing. If your annual expense number is $30,000, divide that figure by your expected rate of return to see how much capital you need to save. Unfortunately, you've got to then multiply the capital amount by 1.25 to 1.5 to account for taxes.
Unfortunately, I was never great with finances growing up. In fact, I had only recently rid myself of some serious credit card debt that had followed me from college and through a good deal of residency. I had poor spending habits and treated my investments like gambling – trying to hit the home run every time. Unfortunately, I struck out quite a bit.
And while real estate is an excellent option, it does require a significant initial investment, so whether or not this passive income stream is right for you depends on your current financial situation. You might be better off starting with an investment strategy where you can build funds until you have a big enough sum to get involved in real estate.

* I use Personal Capital to track all my finances in one place. It’s much easier to use their free software to follow 28 accounts on one platform than to log into various accounts to check my balances. They’ve also got great tools for x-raying your portfolio for excessive fees, recommending a more optimized asset allocation, and planning for retirement with their Retirement Planner.